/* ============================================
   Plexxel Marketing Website — Style System
   Light & Dark Theme with smooth animations
   ============================================ */

/* ---- CSS Custom Properties (Light Default) ---- */
:root {
    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-md: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 2rem;
    --fs-4xl: 2.75rem;
    --fs-5xl: 3.5rem;

    /* Spacing */
    --section-py: 120px;
    --container-max: 1200px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;

    /* Transitions */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.3s var(--ease);
}

/* ---- Light Theme ---- */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fb;
    --bg-tertiary: #f1f3f7;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f9fb;
    --bg-nav: rgba(255, 255, 255, 0.85);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;

    --border: #e2e8f0;
    --border-hover: #cbd5e1;

    --accent: #1B7A3D;
    --accent-hover: #15632F;
    --accent-soft: rgba(27, 122, 61, 0.08);
    --accent-glow: rgba(27, 122, 61, 0.15);

    --gradient-start: #2E7D32;
    --gradient-end: #D32F2F;

    --pro-bg: var(--bg-primary);
    --pro-border: #2E7D32;
    --pro-glow: rgba(46, 125, 50, 0.08);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);

    --mockup-bg: #1e293b;
    --mockup-header: #0f172a;
}

/* ---- Dark Theme ---- */
[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-tertiary: #1a1a24;
    --bg-card: #141420;
    --bg-card-hover: #1a1a2a;
    --bg-nav: rgba(10, 10, 15, 0.9);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;

    --border: #1e293b;
    --border-hover: #334155;

    --accent: #4CAF50;
    --accent-hover: #66BB6A;
    --accent-soft: rgba(76, 175, 80, 0.1);
    --accent-glow: rgba(76, 175, 80, 0.2);

    --gradient-start: #4CAF50;
    --gradient-end: #EF5350;

    --pro-bg: var(--bg-primary);
    --pro-border: #4CAF50;
    --pro-glow: rgba(76, 175, 80, 0.1);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);

    --mockup-bg: #0f172a;
    --mockup-header: #0a0f1a;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Animations ---- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 {
    transition-delay: 0.1s;
}

.delay-2 {
    transition-delay: 0.2s;
}

.delay-3 {
    transition-delay: 0.3s;
}

.delay-4 {
    transition-delay: 0.5s;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font);
    font-weight: 600;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-sm {
    padding: 8px 18px;
    font-size: var(--fs-sm);
}

.btn-lg {
    padding: 14px 32px;
    font-size: var(--fs-md);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 20px var(--accent-glow);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border);
}

.btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.btn-block {
    display: flex;
    justify-content: center;
    width: 100%;
    padding: 14px 24px;
}

/* ========================================
   NAVBAR
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition), border var(--transition);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: var(--fs-xl);
}

.logo-img {
    height: 38px;
    width: auto;
    border-radius: 0;
    transition: filter var(--transition);
}

[data-theme="dark"] .logo-img,
[data-theme="dark"] .footer-logo {
    filter: brightness(1.4) saturate(1.2);
}

.logo-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
    transition: width var(--transition);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

[data-theme="light"] .icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: none;
}

/* ========================================
   HERO
   ======================================== */
.hero {
    padding: 140px 0 80px;
    background: var(--bg-primary);
    overflow: hidden;
}

.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid var(--accent-glow);
    margin-bottom: 24px;
}

.hero-title {
    font-size: var(--fs-5xl);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--fs-lg);
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-bottom: 64px;
}

/* Excel Mockup */
.hero-visual {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
    filter: blur(60px);
    z-index: 0;
    pointer-events: none;
}

.excel-mockup {
    position: relative;
    z-index: 1;
    background: var(--mockup-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-xl);
}

.mockup-header {
    background: var(--mockup-header);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.mockup-dots {
    display: flex;
    gap: 6px;
}

.mockup-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.mockup-dots span:nth-child(1) {
    background: #ef4444;
}

.mockup-dots span:nth-child(2) {
    background: #f59e0b;
}

.mockup-dots span:nth-child(3) {
    background: #22c55e;
}

.mockup-tab {
    font-size: var(--fs-xs);
    font-weight: 600;
    color: #4CAF50;
    padding: 4px 14px;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 4px;
}

.mockup-ribbon {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    overflow-x: auto;
    flex-wrap: wrap;
}

.ribbon-group {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.ribbon-btn {
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 4px;
    color: #94a3b8;
    background: rgba(255, 255, 255, 0.04);
    white-space: nowrap;
    transition: all 0.2s;
}

.ribbon-btn.accent {
    color: #4CAF50;
    background: rgba(76, 175, 80, 0.15);
}

.ribbon-btn.accent2 {
    color: #FF9800;
    background: rgba(255, 152, 0, 0.12);
}

.ribbon-sep {
    width: 1px;
    height: 24px;
    background: rgba(255, 255, 255, 0.08);
    margin: 0 4px;
}

.mockup-grid {
    padding: 0;
}

.grid-row {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr 1fr 1fr;
    gap: 0;
    font-size: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.grid-row span {
    padding: 8px 12px;
    color: #cbd5e1;
    border-right: 1px solid rgba(255, 255, 255, 0.04);
}

.grid-row.header {
    background: rgba(255, 255, 255, 0.04);
}

.grid-row.header span {
    color: #64748b;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 10px;
    letter-spacing: 0.05em;
}

.grid-row.wbs-1 {
    background: rgba(46, 125, 50, 0.15);
}

.grid-row.wbs-1 span:first-child {
    color: #4CAF50;
    font-weight: 600;
}

.grid-row.wbs-2 {
    background: rgba(245, 124, 0, 0.10);
}

.grid-row.wbs-2 span:first-child {
    color: #FF9800;
    font-weight: 500;
}

.grid-row.wbs-3 {
    background: rgba(211, 47, 47, 0.08);
}

.grid-row.wbs-3 span:first-child {
    color: #EF5350;
}

/* ========================================
   SECTION HEADERS
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 100px;
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--accent-soft);
    color: var(--accent);
    margin-bottom: 16px;
}

.pro-badge {
    background: var(--pro-glow);
    color: var(--pro-border);
}

.section-header h2 {
    font-size: var(--fs-4xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.section-header p {
    font-size: var(--fs-lg);
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto;
}

/* ========================================
   FEATURES
   ======================================== */
.features {
    padding: var(--section-py) 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all var(--transition);
    position: relative;
}

.feature-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    background: var(--bg-card-hover);
}

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    color: var(--accent);
    margin-bottom: 18px;
}

.feature-card:nth-child(1) .feature-icon {
    color: #2E7D32;
    background: rgba(46, 125, 50, 0.08);
}

.feature-card:nth-child(2) .feature-icon {
    color: #10b981;
    background: rgba(16, 185, 129, 0.08);
}

.feature-card:nth-child(3) .feature-icon {
    color: #F57C00;
    background: rgba(245, 124, 0, 0.08);
}

.feature-card:nth-child(4) .feature-icon {
    color: #D32F2F;
    background: rgba(211, 47, 47, 0.08);
}

.feature-card:nth-child(5) .feature-icon {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.08);
}

.feature-card:nth-child(6) .feature-icon {
    color: #06b6d4;
    background: rgba(6, 182, 212, 0.08);
}

.feature-card:nth-child(7) .feature-icon {
    color: #ec4899;
    background: rgba(236, 72, 153, 0.08);
}

.feature-card:nth-child(8) .feature-icon {
    color: #14b8a6;
    background: rgba(20, 184, 166, 0.08);
}

.feature-card h3 {
    font-size: var(--fs-md);
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
}

.feature-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 10px;
    border-radius: 100px;
}

.feature-tag.free {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

/* ========================================
   PRO SECTION
   ======================================== */
.pro-section {
    padding: var(--section-py) 0;
    background: var(--pro-bg);
}

.pro-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.pro-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.pro-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    opacity: 0;
    transition: opacity var(--transition);
}

.pro-card:hover {
    border-color: var(--pro-border);
    box-shadow: 0 8px 32px var(--pro-glow);
    transform: translateY(-4px);
}

.pro-card:hover::before {
    opacity: 1;
}

.pro-icon {
    font-size: 28px;
    margin-bottom: 16px;
    display: block;
}

.pro-card h3 {
    font-size: var(--fs-lg);
    font-weight: 700;
    margin-bottom: 8px;
}

.pro-card p {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   PRICING
   ======================================== */
.pricing {
    padding: var(--section-py) 0;
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px 24px;
    transition: all var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.pricing-card.featured {
    border-color: var(--accent);
    box-shadow: 0 8px 40px var(--accent-glow);
}

.pricing-popular {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: #fff;
    font-size: var(--fs-xs);
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pricing-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.pricing-header h3 {
    font-size: var(--fs-xl);
    font-weight: 700;
    margin-bottom: 6px;
}

.pricing-amount {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.price {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1;
}

.period {
    font-size: var(--fs-sm);
    color: var(--text-tertiary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 20px;
    flex-grow: 1;
}

.pricing-features li {
    padding: 5px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--fs-sm);
    color: var(--text-secondary);
}

.pricing-features li.disabled {
    opacity: 0.4;
}

.cross {
    color: #ef4444;
    font-weight: 700;
    font-size: var(--fs-md);
    flex-shrink: 0;
}

.pricing-card>.btn-block {
    margin-top: auto;
}

.check {
    color: #10b981;
    font-weight: 700;
    font-size: var(--fs-md);
    flex-shrink: 0;
}

.pro-check {
    color: var(--accent);
}

.pricing-features li.highlight {
    color: var(--text-primary);
    font-weight: 500;
}

/* ========================================
   CTA
   ======================================== */
.cta {
    padding: var(--section-py) 0;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 500px;
    background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 60%);
    filter: blur(80px);
    pointer-events: none;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: var(--fs-4xl);
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.02em;
}

.cta-content p {
    font-size: var(--fs-lg);
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 32px;
}

.cta-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-bottom: 20px;
}

.cta-note {
    font-size: var(--fs-xs) !important;
    color: var(--text-tertiary) !important;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 64px 0 32px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    height: 56px;
    width: auto;
    border-radius: 0;
    margin-bottom: 12px;
}

.footer-name {
    font-size: var(--fs-xl);
    font-weight: 700;
    display: block;
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col h4 {
    font-size: var(--fs-sm);
    font-weight: 600;
    margin-bottom: 4px;
}

.footer-col a {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
}

.footer-bottom p {
    font-size: var(--fs-xs);
    color: var(--text-tertiary);
    text-align: center;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-title {
        font-size: var(--fs-4xl);
    }
}

@media (max-width: 768px) {
    :root {
        --section-py: 80px;
    }

    .nav-links {
        display: none;
    }

    .hero-title {
        font-size: var(--fs-3xl);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .pro-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .section-header h2 {
        font-size: var(--fs-3xl);
    }

    .mockup-ribbon {
        display: none;
    }

    .cta-actions {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        flex-direction: column;
        gap: 40px;
    }

    .footer-links {
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .price {
        font-size: 36px;
    }
}