/* ==========================================================================
   SIGMA (Σ) STEM LANDING PAGE - ACADIMY LMS INTEGRATED DESIGN SYSTEM
   Supports both Light and Dark mode synced with Acadimy theme.js & style.css
   ========================================================================== */

@import url('thmanyah.css');

:root {
    --sigma-bg-dark: #F8FAFC;
    --sigma-bg-gradient: radial-gradient(circle at 50% 0%, #EEF2FF 0%, #F1F5F9 50%, #F8FAFC 100%);
    --sigma-card-bg: rgba(255, 255, 255, 0.88);
    --sigma-card-bg-hover: #FFFFFF;
    --sigma-glass-border: rgba(99, 102, 241, 0.18);
    --sigma-glass-border-hover: rgba(99, 102, 241, 0.45);

    /* Primary & Accent Colors */
    --sigma-cyan: #0284C7;
    --sigma-cyan-light: #38BDF8;
    --sigma-cyan-glow: rgba(2, 132, 199, 0.25);
    --sigma-violet: #6366F1;
    --sigma-violet-light: #818CF8;
    --sigma-violet-glow: rgba(99, 102, 241, 0.3);

    /* Text Colors */
    --sigma-text-bright: #0F172A;
    --sigma-text-main: #1E293B;
    --sigma-text-muted: #64748B;
    --sigma-text-dim: #94A3B8;

    /* Header & Footer */
    --sigma-header-bg: rgba(255, 255, 255, 0.92);
    --sigma-footer-bg: #0F172A;
    --sigma-footer-text: #E2E8F0;

    /* Fonts */
    --sigma-font-main: 'Thmanyah Sans', 'Thmanyah', -apple-system, BlinkMacSystemFont, sans-serif;
    --sigma-font-heading: 'Thmanyah Serif Display', 'Thmanyah', serif;
    --sigma-font-reading: 'Thmanyah Serif Text', 'Thmanyah', serif;

    /* Transitions & Shadows */
    --sigma-tr-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --sigma-tr-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --sigma-glow-shadow: 0 4px 20px rgba(99, 102, 241, 0.15);
    --sigma-card-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.08), 0 0 15px rgba(99, 102, 241, 0.05);
}

[data-theme="dark"] {
    --sigma-bg-dark: #070415;
    --sigma-bg-gradient: radial-gradient(circle at 50% 0%, #1c0f45 0%, #0c0624 50%, #070415 100%);
    --sigma-card-bg: rgba(20, 11, 48, 0.65);
    --sigma-card-bg-hover: rgba(28, 15, 66, 0.85);
    --sigma-glass-border: rgba(0, 242, 254, 0.15);
    --sigma-glass-border-hover: rgba(0, 242, 254, 0.45);

    --sigma-cyan: #00F2FE;
    --sigma-cyan-light: #4FACFE;
    --sigma-cyan-glow: rgba(0, 242, 254, 0.35);
    --sigma-violet: #7B2CBF;
    --sigma-violet-light: #9D4EDD;
    --sigma-violet-glow: rgba(123, 44, 191, 0.4);

    --sigma-text-bright: #FFFFFF;
    --sigma-text-main: #E2E8F0;
    --sigma-text-muted: #94A3B8;
    --sigma-text-dim: #64748B;

    --sigma-header-bg: rgba(7, 4, 21, 0.88);
    --sigma-footer-bg: #04020B;
    --sigma-footer-text: #CBD5E1;
    --sigma-glow-shadow: 0 0 25px rgba(0, 242, 254, 0.25);
    --sigma-card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 20px rgba(123, 44, 191, 0.15);
}

/* Base Resets & Transitions */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body.sigma-landing {
    background-color: var(--sigma-bg-dark);
    background-image: var(--sigma-bg-gradient);
    background-attachment: fixed;
    color: var(--sigma-text-main);
    font-family: var(--sigma-font-main);
    direction: rtl;
    text-align: right;
    overflow-x: hidden;
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Ambient Lighting & Background Motifs */
.sigma-ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.sigma-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.22;
    animation: sigmaOrbPulse 12s infinite alternate ease-in-out;
}

.sigma-orb-1 {
    top: -10%;
    right: 15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--sigma-cyan) 0%, rgba(0, 242, 254, 0) 70%);
}

.sigma-orb-2 {
    top: 40%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--sigma-violet) 0%, rgba(123, 44, 191, 0) 70%);
    animation-delay: -6s;
}

.sigma-orb-3 {
    bottom: -10%;
    right: 30%;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, #3A0CA3 0%, rgba(58, 12, 163, 0) 70%);
    animation-delay: -3s;
}

@keyframes sigmaOrbPulse {
    0% {
        transform: scale(1) translate(0, 0);
        opacity: 0.18;
    }

    50% {
        transform: scale(1.15) translate(30px, -20px);
        opacity: 0.3;
    }

    100% {
        transform: scale(0.9) translate(-20px, 30px);
        opacity: 0.18;
    }
}

.sigma-watermark {
    position: absolute;
    font-size: 24rem;
    font-weight: 900;
    color: rgba(99, 102, 241, 0.03);
    user-select: none;
    pointer-events: none;
    line-height: 1;
    font-family: var(--sigma-font-main);
    z-index: 0;
}

[data-theme="dark"] .sigma-watermark {
    color: rgba(0, 242, 254, 0.025);
}

.watermark-1 {
    top: 10%;
    right: -5%;
    transform: rotate(-15deg);
}

.watermark-2 {
    top: 55%;
    left: -8%;
    transform: rotate(20deg);
}

.sigma-container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 2;
}

/* ==========================================================================
   STICKY HEADER (ALIGNED WITH ACADIMY THEME)
   ========================================================================== */
.sigma-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.15rem 0;
    transition: all var(--sigma-tr-normal);
}

.sigma-header.scrolled {
    padding: 0.8rem 0;
    background: var(--sigma-header-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--sigma-glass-border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.sigma-nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.sigma-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.sigma-logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(168, 85, 247, 0.4) 100%);
    border: 1.5px solid var(--sigma-violet);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sigma-violet);
    font-size: 1.5rem;
    font-weight: 900;
    box-shadow: 0 0 15px var(--sigma-violet-glow);
    transition: transform var(--sigma-tr-fast);
}

[data-theme="dark"] .sigma-logo-icon {
    border-color: var(--sigma-cyan);
    color: var(--sigma-cyan);
    box-shadow: 0 0 15px var(--sigma-cyan-glow);
}

.sigma-logo:hover .sigma-logo-icon {
    transform: rotate(-10deg) scale(1.05);
}

.sigma-logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--sigma-text-bright);
    letter-spacing: -0.5px;
}

.sigma-logo-text span {
    background: linear-gradient(135deg, var(--sigma-violet) 0%, var(--sigma-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sigma-logo-sub {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--sigma-text-muted);
    margin-right: 0.2rem;
}

/* Nav Links */
.sigma-nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.sigma-nav-link {
    color: var(--sigma-text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.98rem;
    transition: color var(--sigma-tr-fast);
    position: relative;
    padding: 0.4rem 0;
}

.sigma-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0%;
    height: 2.5px;
    background: var(--sigma-cyan);
    border-radius: 2px;
    transition: width var(--sigma-tr-fast);
}

.sigma-nav-link:hover {
    color: var(--sigma-cyan);
}

.sigma-nav-link:hover::after {
    width: 100%;
}

/* ==========================================================================
   UNIFIED PLATFORM SEARCH BAR (Courses & Teachers)
   ========================================================================== */
.sigma-search-wrap {
    position: relative;
    z-index: 1050;
}

.sigma-search-box {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md, 12px);
    padding: 0 0.85rem;
    gap: 0.55rem;
    height: 42px;
    width: 220px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.sigma-search-box:focus-within {
    width: 280px;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15), var(--shadow-md);
    background: var(--bg-card);
}

[data-theme="dark"] .sigma-search-box:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 242, 254, 0.2), 0 0 15px rgba(0, 242, 254, 0.15);
}

.sigma-search-icon {
    color: var(--primary-color);
    font-size: 0.9rem;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.sigma-search-box:focus-within .sigma-search-icon {
    transform: scale(1.1);
}

.sigma-search-input {
    border: none;
    background: transparent;
    color: var(--text-main);
    font-family: var(--sigma-font-main);
    font-size: 0.86rem;
    font-weight: 600;
    width: 100%;
    outline: none;
}

.sigma-search-input::placeholder {
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 500;
}

.sigma-search-clear-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.82rem;
    cursor: pointer;
    padding: 0 0.15rem;
    line-height: 1;
    transition: color 0.15s ease;
    display: none;
}

.sigma-search-clear-btn:hover {
    color: var(--danger-color, #ef4444);
}

.sigma-search-spinner {
    width: 15px;
    height: 15px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: sigmaSearchSpin 0.6s linear infinite;
    display: none;
    flex-shrink: 0;
}

@keyframes sigmaSearchSpin {
    to { transform: rotate(360deg); }
}

/* Dropdown Container */
.sigma-search-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 380px;
    max-width: 92vw;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    max-height: 460px;
    overflow-y: auto;
    z-index: 1100;
    padding: 0.65rem;
    display: none;
    animation: sigmaDropdownFade 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes sigmaDropdownFade {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sigma-search-group {
    margin-bottom: 0.65rem;
}

.sigma-search-group:last-child {
    margin-bottom: 0;
}

.sigma-search-group-title {
    font-size: 0.76rem;
    font-weight: 800;
    color: var(--primary-color);
    padding: 0.3rem 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.35rem;
}

.sigma-search-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.55rem 0.65rem;
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-main);
    transition: all 0.15s ease;
    cursor: pointer;
}

.sigma-search-item:hover,
.sigma-search-item.active-item {
    background: var(--table-row-hover, rgba(2, 132, 199, 0.06));
    transform: translateX(-2px);
}

.sigma-search-item-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: rgba(2, 132, 199, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 0.95rem;
    flex-shrink: 0;
}

.sigma-search-item-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.sigma-search-item-info {
    flex: 1;
    min-width: 0;
}

.sigma-search-item-title {
    font-size: 0.86rem;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.15rem;
}

.sigma-search-item-sub {
    font-size: 0.74rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.45rem;
    flex-wrap: wrap;
}

.sigma-search-badge {
    background: rgba(2, 132, 199, 0.08);
    color: var(--primary-color);
    padding: 0.1rem 0.45rem;
    border-radius: 6px;
    font-size: 0.68rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
}

.sigma-search-price {
    font-weight: 700;
    font-size: 0.76rem;
    color: var(--success-color, #10b981);
    margin-right: auto;
}

.sigma-search-empty {
    text-align: center;
    padding: 1.25rem 0.75rem;
    color: var(--text-muted);
}

.sigma-search-empty i {
    font-size: 1.8rem;
    color: var(--text-muted);
    opacity: 0.6;
    margin-bottom: 0.4rem;
    display: block;
}

.sigma-search-empty p {
    font-size: 0.85rem;
    margin: 0.2rem 0;
    color: var(--text-main);
}

.sigma-search-hint {
    font-size: 0.74rem;
    color: var(--text-muted);
}

.sigma-search-highlight {
    background: rgba(2, 132, 199, 0.18);
    color: var(--primary-color);
    font-weight: 800;
    border-radius: 3px;
    padding: 0 2px;
}

[data-theme="dark"] .sigma-search-highlight {
    background: rgba(0, 242, 254, 0.25);
    color: var(--primary-color);
}

/* Card Pulse on match */
.sigma-card-highlighted {
    animation: sigmaHighlightPulse 2s ease-in-out;
}

@keyframes sigmaHighlightPulse {
    0%, 100% {
        box-shadow: var(--shadow-md);
        border-color: var(--border-color);
    }
    30%, 70% {
        box-shadow: 0 0 25px rgba(2, 132, 199, 0.35), 0 0 10px rgba(99, 102, 241, 0.25);
        border-color: var(--primary-color);
        transform: translateY(-6px) scale(1.02);
    }
}

@media (max-width: 991px) {
    .sigma-search-wrap {
        display: none;
    }
}

/* Header Actions */
.sigma-header-actions {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

/* Theme Toggle Button Alignment */
.sigma-header-actions .theme-toggle-btn {
    margin-left: 0.25rem;
}

/* Generic Buttons */
.sigma-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.75rem 1.6rem;
    border-radius: 12px;
    font-size: 0.98rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--sigma-tr-normal);
    border: none;
    outline: none;
    font-family: var(--sigma-font-main);
}

.sigma-btn-primary {
    background: linear-gradient(135deg, var(--sigma-violet) 0%, var(--sigma-cyan) 100%);
    color: #FFFFFF;
    box-shadow: 0 4px 15px var(--sigma-violet-glow);
}

[data-theme="dark"] .sigma-btn-primary {
    background: linear-gradient(135deg, #00F2FE 0%, #00C8FF 50%, #0099FF 100%);
    color: #04020E;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
}

.sigma-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--sigma-violet-glow);
}

[data-theme="dark"] .sigma-btn-primary:hover {
    color: #04020E;
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.7);
}

.sigma-btn-outline {
    background: var(--sigma-card-bg);
    color: var(--sigma-text-bright);
    border: 1.5px solid var(--sigma-glass-border);
    backdrop-filter: blur(8px);
}

.sigma-btn-outline:hover {
    background: rgba(99, 102, 241, 0.08);
    border-color: var(--sigma-violet);
    color: var(--sigma-violet);
    transform: translateY(-3px);
}

[data-theme="dark"] .sigma-btn-outline:hover {
    background: rgba(0, 242, 254, 0.12);
    border-color: var(--sigma-cyan);
    color: var(--sigma-cyan);
}

.sigma-btn-ghost {
    background: transparent;
    color: var(--sigma-text-main);
}

.sigma-btn-ghost:hover {
    color: var(--sigma-cyan);
    background: rgba(99, 102, 241, 0.06);
}

.sigma-mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--sigma-text-bright);
    font-size: 1.6rem;
    cursor: pointer;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.sigma-hero {
    padding-top: 10rem;
    padding-bottom: 5rem;
    position: relative;
    z-index: 2;
}

.sigma-hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
    align-items: center;
}

.sigma-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1.25rem;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 50px;
    color: var(--sigma-violet);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

[data-theme="dark"] .sigma-hero-badge {
    background: rgba(0, 242, 254, 0.08);
    color: var(--sigma-cyan);
}

.sigma-hero-badge .pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--sigma-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--sigma-cyan);
    animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
    0% {
        transform: scale(0.95);
        opacity: 1;
    }

    70% {
        transform: scale(1.1);
        opacity: 0.5;
    }

    100% {
        transform: scale(0.95);
        opacity: 1;
    }
}

.sigma-hero-title {
    font-size: 3.4rem;
    font-weight: 900;
    line-height: 1.2;
    color: var(--sigma-text-bright);
    margin-bottom: 1.25rem;
}

.sigma-hero-title .gradient-text {
    background: linear-gradient(135deg, var(--sigma-text-bright) 0%, var(--sigma-violet) 50%, var(--sigma-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.sigma-hero-title .sigma-symbol-inline {
    color: var(--sigma-cyan);
    font-size: 3.6rem;
    vertical-align: middle;
    margin: 0 0.2rem;
}

.sigma-hero-desc {
    font-size: 1.18rem;
    color: var(--sigma-text-muted);
    line-height: 1.8;
    margin-bottom: 2.25rem;
    max-width: 90%;
}

.sigma-hero-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}

/* Stats Counter Grid */
.sigma-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--sigma-glass-border);
}

.sigma-stat-card {
    display: flex;
    flex-direction: column;
}

.sigma-stat-number {
    font-size: 2.1rem;
    font-weight: 900;
    color: var(--sigma-text-bright);
    background: linear-gradient(135deg, var(--sigma-violet) 0%, var(--sigma-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-family: var(--sigma-font-main);
    line-height: 1.1;
}

.sigma-stat-label {
    font-size: 0.9rem;
    color: var(--sigma-text-muted);
    margin-top: 0.35rem;
    font-weight: 500;
}

/* Hero Math Graphic Container */
.sigma-hero-graphic-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sigma-canvas-box {
    width: 100%;
    height: 480px;
    background: var(--sigma-card-bg);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 24px;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(12px);
    box-shadow: var(--sigma-card-shadow);
}

#sigmaMathCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.sigma-canvas-overlay-tag {
    position: absolute;
    bottom: 20px;
    right: 20px;
    padding: 0.6rem 1.2rem;
    background: var(--sigma-header-bg);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--sigma-cyan);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* ==========================================================================
   COMMUNITY BANNER SECTION
   ========================================================================== */
.sigma-community-section {
    padding: 3rem 0;
    position: relative;
    z-index: 2;
}

.sigma-community-banner {
    background: linear-gradient(135deg, var(--sigma-card-bg) 0%, rgba(99, 102, 241, 0.1) 100%);
    border: 1.5px solid var(--sigma-glass-border);
    border-radius: 28px;
    padding: 3.5rem 4rem;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(16px);
    box-shadow: var(--sigma-card-shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.sigma-community-banner::before {
    content: 'Σ';
    position: absolute;
    left: 5%;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18rem;
    font-weight: 900;
    color: rgba(99, 102, 241, 0.04);
    pointer-events: none;
    user-select: none;
    line-height: 1;
}

.sigma-community-content {
    max-width: 650px;
}

.sigma-community-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--sigma-text-bright);
    margin-bottom: 0.85rem;
}

.sigma-community-title span {
    color: var(--sigma-cyan);
}

.sigma-community-desc {
    font-size: 1.08rem;
    color: var(--sigma-text-muted);
    line-height: 1.7;
}

/* ==========================================================================
   TEACHERS SECTION
   ========================================================================== */
.sigma-section {
    padding: 6rem 0;
    position: relative;
    z-index: 2;
}

.sigma-section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem auto;
}

.sigma-section-badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 30px;
    color: var(--sigma-violet);
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

[data-theme="dark"] .sigma-section-badge {
    color: var(--sigma-cyan);
}

.sigma-section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--sigma-text-bright);
    margin-bottom: 1rem;
}

.sigma-section-subtitle {
    font-size: 1.1rem;
    color: var(--sigma-text-muted);
}

.sigma-teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 2rem;
}

.sigma-teacher-card {
    background: var(--sigma-card-bg);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(16px);
    transition: all var(--sigma-tr-normal);
    position: relative;
    overflow: hidden;
}

.sigma-teacher-card:hover {
    transform: translateY(-8px);
    background: var(--sigma-card-bg-hover);
    border-color: var(--sigma-glass-border-hover);
    box-shadow: var(--sigma-card-shadow);
}

.sigma-teacher-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 0.3rem 0.8rem;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 20px;
    color: var(--sigma-violet);
    font-size: 0.78rem;
    font-weight: 700;
}

[data-theme="dark"] .sigma-teacher-badge {
    background: rgba(123, 44, 191, 0.4);
    color: #F1F5F9;
}

.sigma-teacher-img-wrap {
    width: 110px;
    height: 110px;
    margin: 0.5rem auto 1.25rem auto;
    border-radius: 50%;
    padding: 4px;
    background: linear-gradient(135deg, var(--sigma-violet) 0%, var(--sigma-cyan) 100%);
    box-shadow: 0 0 20px var(--sigma-violet-glow);
    position: relative;
}

.sigma-teacher-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    background-color: var(--sigma-bg-dark);
}

.sigma-teacher-name {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--sigma-text-bright);
    margin-bottom: 0.35rem;
}

.sigma-teacher-spec {
    font-size: 0.92rem;
    color: var(--sigma-cyan);
    font-weight: 600;
    margin-bottom: 1rem;
}

.sigma-teacher-socials {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.sigma-social-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid var(--sigma-glass-border);
    color: var(--sigma-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 0.95rem;
    transition: all var(--sigma-tr-fast);
}

.sigma-social-btn:hover {
    background: rgba(2, 132, 199, 0.12);
    border-color: var(--sigma-cyan);
    color: var(--sigma-cyan);
    transform: translateY(-2px);
}

.sigma-teacher-btn {
    width: 100%;
    padding: 0.65rem;
    font-size: 0.9rem;
}

/* ==========================================================================
   HOW YOU BENEFIT SECTION (4 STEPS)
   ========================================================================== */
.sigma-steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.sigma-step-card {
    background: var(--sigma-card-bg);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 22px;
    padding: 2.25rem 2rem;
    position: relative;
    backdrop-filter: blur(16px);
    transition: all var(--sigma-tr-normal);
}

.sigma-step-card:hover {
    transform: translateY(-8px);
    border-color: var(--sigma-glass-border-hover);
    box-shadow: var(--sigma-card-shadow);
}

.sigma-step-num {
    font-size: 3rem;
    font-weight: 900;
    font-family: var(--sigma-font-main);
    background: linear-gradient(135deg, var(--sigma-violet) 0%, var(--sigma-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 1.25rem;
}

.sigma-step-icon {
    width: 52px;
    height: 52px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sigma-violet);
    font-size: 1.4rem;
    margin-bottom: 1.25rem;
}

[data-theme="dark"] .sigma-step-icon {
    color: var(--sigma-cyan);
}

.sigma-step-title {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--sigma-text-bright);
    margin-bottom: 0.75rem;
}

.sigma-step-desc {
    font-size: 0.98rem;
    color: var(--sigma-text-muted);
    line-height: 1.7;
}

/* ==========================================================================
   FEATURED COURSES SECTION
   ========================================================================== */
.sigma-courses-filter {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.sigma-filter-tab {
    padding: 0.65rem 1.5rem;
    border-radius: 30px;
    background: var(--sigma-card-bg);
    border: 1px solid var(--sigma-glass-border);
    color: var(--sigma-text-muted);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--sigma-tr-fast);
    font-family: var(--sigma-font-main);
}

.sigma-filter-tab:hover {
    color: var(--sigma-text-bright);
    border-color: var(--sigma-violet);
}

.sigma-filter-tab.active {
    background: linear-gradient(135deg, var(--sigma-violet) 0%, var(--sigma-cyan) 100%);
    border-color: transparent;
    color: #FFFFFF;
    box-shadow: 0 4px 15px var(--sigma-violet-glow);
}

[data-theme="dark"] .sigma-filter-tab.active {
    color: #04020E;
}

.sigma-courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.sigma-course-card {
    background: var(--sigma-card-bg);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 22px;
    padding: 1.75rem;
    backdrop-filter: blur(16px);
    transition: all var(--sigma-tr-normal);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.sigma-course-card:hover {
    transform: translateY(-8px);
    border-color: var(--sigma-glass-border-hover);
    box-shadow: var(--sigma-card-shadow);
}

.sigma-course-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.sigma-course-icon-badge {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(2, 132, 199, 0.25) 100%);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sigma-violet);
    font-size: 1.3rem;
    font-weight: 800;
}

[data-theme="dark"] .sigma-course-icon-badge {
    color: var(--sigma-cyan);
}

.sigma-grade-badge {
    padding: 0.3rem 0.85rem;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid var(--sigma-glass-border);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--sigma-text-muted);
}

.sigma-course-title {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--sigma-text-bright);
    margin-bottom: 0.85rem;
    line-height: 1.35;
}

.sigma-course-instructor {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--sigma-glass-border);
}

.sigma-course-instructor img {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    object-fit: cover;
    border: 1.5px solid var(--sigma-violet);
}

.sigma-instructor-name {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--sigma-text-main);
}

.sigma-course-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.sigma-course-price {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--sigma-violet);
    font-family: var(--sigma-font-main);
}

[data-theme="dark"] .sigma-course-price {
    color: var(--sigma-cyan);
}

.sigma-course-price span {
    font-size: 0.85rem;
    color: var(--sigma-text-muted);
    font-weight: 500;
}

.sigma-courses-action-wrap {
    text-align: center;
}

/* ==========================================================================
   CLOSING CTA SECTION
   ========================================================================== */
.sigma-cta-section {
    padding: 6rem 0;
    position: relative;
    z-index: 2;
}

.sigma-cta-box {
    background: linear-gradient(135deg, var(--sigma-card-bg) 0%, rgba(99, 102, 241, 0.15) 100%);
    border: 1.5px solid var(--sigma-glass-border);
    border-radius: 32px;
    padding: 4.5rem 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(20px);
    box-shadow: var(--sigma-card-shadow);
}

.sigma-cta-box::before {
    content: 'Σ';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 32rem;
    font-weight: 900;
    color: rgba(99, 102, 241, 0.02);
    pointer-events: none;
    user-select: none;
    line-height: 1;
}

.sigma-cta-title {
    font-size: 2.8rem;
    font-weight: 900;
    color: var(--sigma-text-bright);
    margin-bottom: 1.25rem;
}

.sigma-cta-desc {
    font-size: 1.2rem;
    color: var(--sigma-text-muted);
    max-width: 650px;
    margin: 0 auto 2.5rem auto;
    line-height: 1.8;
}

.sigma-cta-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.sigma-cta-note {
    font-size: 0.95rem;
    color: var(--sigma-text-dim);
    font-weight: 500;
}

/* ==========================================================================
   FOOTER (ALIGNED WITH ACADIMY)
   ========================================================================== */
.sigma-footer {
    background: var(--sigma-footer-bg);
    color: var(--sigma-footer-text);
    border-top: 1px solid var(--sigma-glass-border);
    padding: 5rem 0 2rem 0;
    position: relative;
    z-index: 2;
}

.sigma-footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 3rem;
    margin-bottom: 4rem;
}

.sigma-footer-brand {
    padding-left: 2rem;
}

.sigma-footer-brand .sigma-logo {
    margin-bottom: 1.25rem;
}

.sigma-footer-brand p {
    color: var(--sigma-text-muted);
    font-size: 0.98rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.sigma-footer-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: #FFFFFF;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.sigma-footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 30px;
    height: 2px;
    background: var(--sigma-cyan);
    border-radius: 2px;
}

.sigma-footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.sigma-footer-links a {
    color: var(--sigma-text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--sigma-tr-fast);
}

.sigma-footer-links a:hover {
    color: var(--sigma-cyan);
}

.sigma-contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sigma-contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--sigma-text-muted);
    font-size: 0.95rem;
}

.sigma-contact-item i {
    color: var(--sigma-cyan);
    font-size: 1.1rem;
}

.sigma-footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--sigma-text-dim);
    font-size: 0.9rem;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS & MOBILE UX ENHANCEMENTS
   ========================================================================== */

.sigma-mobile-nav-cta {
    display: none !important;
}

/* Tablets & Small Laptops (<= 1024px) */
@media (max-width: 1024px) {
    .sigma-container {
        padding: 0 1.5rem !important;
    }

    .sigma-hero-title {
        font-size: 2.5rem !important;
    }

    .sigma-hero-grid {
        grid-template-columns: 1fr !important;
        gap: 2.5rem !important;
    }

    .sigma-hero-graphic-wrap {
        order: -1;
        width: 100%;
    }

    .sigma-canvas-box {
        height: 320px !important;
    }

    .sigma-teachers-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)) !important;
        gap: 1.25rem !important;
    }

    .sigma-courses-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)) !important;
        gap: 1.25rem !important;
    }

    .sigma-community-banner {
        flex-direction: column !important;
        text-align: center !important;
        padding: 2.5rem 1.75rem !important;
        gap: 1.5rem !important;
    }

    .sigma-community-banner::before {
        display: none !important;
    }

    .sigma-footer-grid {
        grid-template-columns: 1fr 1fr !important;
        gap: 2.5rem !important;
    }

    .sigma-footer-brand {
        padding-left: 0 !important;
    }
}

/* Mobile & Tablet Portrait (<= 768px) */
@media (max-width: 768px) {

    html,
    body {
        overflow-x: hidden !important;
        width: 100% !important;
    }

    .sigma-header-actions .sigma-btn-ghost,
    .sigma-header-actions .sigma-btn-primary {
        display: none !important;
    }

    .sigma-mobile-toggle {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
    }

    .sigma-nav-menu {
        display: none;
        position: absolute !important;
        top: 100% !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        background: var(--sigma-header-bg) !important;
        backdrop-filter: blur(20px) !important;
        -webkit-backdrop-filter: blur(20px) !important;
        padding: 1.25rem 1.25rem !important;
        flex-direction: column !important;
        gap: 0.85rem !important;
        border-bottom: 1.5px solid var(--sigma-glass-border) !important;
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3) !important;
        z-index: 9999 !important;
    }

    .sigma-nav-menu.active {
        display: flex !important;
    }

    .sigma-mobile-nav-cta {
        display: flex !important;
        flex-direction: column !important;
        gap: 0.6rem !important;
        width: 100% !important;
        margin-top: 0.75rem !important;
        padding-top: 0.75rem !important;
        border-top: 1px solid var(--sigma-glass-border) !important;
    }

    .sigma-hero {
        padding-top: 5.5rem !important;
        padding-bottom: 2.5rem !important;
    }

    .sigma-hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .sigma-hero-badge {
        font-size: 0.78rem !important;
        padding: 0.35rem 0.85rem !important;
    }

    .sigma-hero-title {
        font-size: 2.0rem !important;
        line-height: 1.35 !important;
    }

    .sigma-hero-desc {
        font-size: 0.95rem !important;
        line-height: 1.6 !important;
    }

    .sigma-hero-actions {
        width: 100% !important;
        flex-direction: column !important;
        gap: 0.65rem !important;
    }

    .sigma-hero-actions .sigma-btn {
        width: 100% !important;
        justify-content: center !important;
    }

    .sigma-stats-grid {
        grid-template-columns: 1fr !important;
        gap: 0.85rem !important;
        text-align: center !important;
        width: 100% !important;
    }

    .sigma-stat-card {
        padding: 1rem 0.85rem !important;
    }

    .sigma-section {
        padding: 3rem 0 !important;
    }

    .sigma-section-title {
        font-size: 1.75rem !important;
    }

    .sigma-section-subtitle {
        font-size: 0.92rem !important;
    }

    .sigma-teachers-grid {
        grid-template-columns: 1fr !important;
    }

    .sigma-teacher-card {
        padding: 1.5rem 1.25rem !important;
    }

    .sigma-courses-grid {
        grid-template-columns: 1fr !important;
    }

    .sigma-course-card {
        border-radius: 20px !important;
    }

    .sigma-cta-box {
        padding: 2.5rem 1.25rem !important;
        border-radius: 24px !important;
    }

    .sigma-cta-title {
        font-size: 1.75rem !important;
    }

    .sigma-cta-desc {
        font-size: 0.98rem !important;
    }

    .sigma-cta-actions {
        flex-direction: column !important;
        width: 100% !important;
    }

    .sigma-cta-actions .sigma-btn {
        width: 100% !important;
        justify-content: center !important;
    }

    .sigma-footer-grid {
        grid-template-columns: 1fr !important;
        gap: 2rem !important;
        text-align: center !important;
    }

    .sigma-footer-title::after {
        right: 50% !important;
        transform: translateX(50%) !important;
    }

    .sigma-contact-item {
        justify-content: center !important;
    }

    .sigma-footer-bottom {
        flex-direction: column !important;
        gap: 0.75rem !important;
        text-align: center !important;
    }
}

/* Small Smartphone Devices (<= 480px) */
@media (max-width: 480px) {
    .sigma-container {
        padding: 0 0.85rem !important;
    }

    .sigma-logo-text {
        font-size: 1.05rem !important;
    }

    .sigma-logo-icon {
        width: 32px !important;
        height: 32px !important;
        font-size: 1.1rem !important;
    }

    .sigma-hero-title {
        font-size: 1.65rem !important;
    }

    .sigma-canvas-box {
        height: 220px !important;
        border-radius: 18px !important;
    }

    .sigma-canvas-overlay-tag {
        font-size: 0.7rem !important;
        padding: 0.35rem 0.7rem !important;
    }

    .sigma-stat-number {
        font-size: 1.65rem !important;
    }

    .sigma-community-title {
        font-size: 1.4rem !important;
    }

    .sigma-community-desc {
        font-size: 0.88rem !important;
    }

    .sigma-cta-title {
        font-size: 1.45rem !important;
    }
}