/* ======================================================
   GSTA 2 Product Site — Standalone dark SaaS design
   Completely independent from nap-nap.com main styles
   ====================================================== */

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

:root {
    --g-bg:        #0a0e1a;
    --g-surface:   #111827;
    --g-surface-2: #1e293b;
    --g-border:    #334155;
    --g-text:      #e2e8f0;
    --g-text-dim:  #94a3b8;
    --g-accent:    #3b82f6;
    --g-accent-2:  #8b5cf6;
    --g-cyan:      #06b6d4;
    --g-green:     #10b981;
    --g-orange:    #f59e0b;
    --g-white:     #ffffff;
    --g-radius:    12px;
    --g-radius-lg: 20px;
    --g-font: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --g-max-w:     1200px;
}

.gsta-body {
    font-family: var(--g-font);
    background: var(--g-bg);
    color: var(--g-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* --- Header --- */
.gsta-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(51, 65, 85, 0.5);
}

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

/* --- Logo --- */
.gsta-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--g-white);
}

.gsta-logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--g-accent), var(--g-accent-2));
    border-radius: 10px;
    font-weight: 900;
    font-size: 20px;
    color: var(--g-white);
}

.gsta-logo-text {
    font-weight: 800;
    font-size: 22px;
    letter-spacing: -0.5px;
}

.gsta-logo-ver {
    font-size: 14px;
    font-weight: 600;
    color: var(--g-accent);
    margin-left: 2px;
    vertical-align: super;
}

/* --- Nav --- */
.gsta-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.gsta-nav-link {
    color: var(--g-text-dim);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s;
}

.gsta-nav-link:hover {
    color: var(--g-white);
    background: rgba(255,255,255,0.06);
}

.gsta-nav-cta {
    background: linear-gradient(135deg, var(--g-accent), var(--g-accent-2));
    color: var(--g-white) !important;
    padding: 8px 20px;
}

.gsta-nav-cta:hover {
    opacity: 0.9;
    background: linear-gradient(135deg, var(--g-accent), var(--g-accent-2));
}

/* --- Mobile Menu Button --- */
.gsta-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.gsta-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--g-text);
    border-radius: 2px;
    transition: all 0.3s;
}

.gsta-menu-btn.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.gsta-menu-btn.is-open span:nth-child(2) { opacity: 0; }
.gsta-menu-btn.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Hero Section --- */
.gsta-hero {
    padding: 140px 24px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.gsta-hero::before {
    content: '';
    position: absolute;
    top: -200px; left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.gsta-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--g-accent);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 999px;
    margin-bottom: 24px;
}

.gsta-hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -1px;
    max-width: 800px;
    margin: 0 auto 16px;
}

.gsta-hero h1 .accent {
    background: linear-gradient(135deg, var(--g-accent), var(--g-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.gsta-hero-sub {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--g-text-dim);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.gsta-hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* --- Buttons --- */
.gsta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--g-font);
    font-size: 15px;
    font-weight: 700;
    padding: 14px 28px;
    border-radius: 10px;
    text-decoration: none;
    transition: all 0.25s;
    cursor: pointer;
    border: none;
}

.gsta-btn-primary {
    background: linear-gradient(135deg, var(--g-accent), var(--g-accent-2));
    color: var(--g-white);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.gsta-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.45);
}

.gsta-btn-outline {
    background: transparent;
    color: var(--g-text);
    border: 1px solid var(--g-border);
}

.gsta-btn-outline:hover {
    border-color: var(--g-accent);
    color: var(--g-accent);
    background: rgba(59, 130, 246, 0.05);
}

/* --- Section --- */
.gsta-section {
    padding: 80px 24px;
    max-width: var(--g-max-w);
    margin: 0 auto;
}

.gsta-section-label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--g-accent);
    margin-bottom: 12px;
}

.gsta-section-title {
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
}

.gsta-section-desc {
    font-size: 16px;
    color: var(--g-text-dim);
    max-width: 640px;
    line-height: 1.8;
    margin-bottom: 48px;
}

.gsta-section-center { text-align: center; }
.gsta-section-center .gsta-section-desc { margin-left: auto; margin-right: auto; }

/* --- Feature Cards --- */
.gsta-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.gsta-feature-card {
    background: var(--g-surface);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius-lg);
    padding: 32px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.gsta-feature-card:hover {
    border-color: var(--g-accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.1);
}

.gsta-feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.gsta-feature-icon.blue    { background: rgba(59, 130, 246, 0.15); color: var(--g-accent); }
.gsta-feature-icon.purple  { background: rgba(139, 92, 246, 0.15); color: var(--g-accent-2); }
.gsta-feature-icon.cyan    { background: rgba(6, 182, 212, 0.15);  color: var(--g-cyan); }
.gsta-feature-icon.green   { background: rgba(16, 185, 129, 0.15); color: var(--g-green); }
.gsta-feature-icon.orange  { background: rgba(245, 158, 11, 0.15); color: var(--g-orange); }
.gsta-feature-icon.red     { background: rgba(239, 68, 68, 0.15);  color: #ef4444; }

.gsta-feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--g-white);
}

.gsta-feature-card p {
    font-size: 14px;
    color: var(--g-text-dim);
    line-height: 1.8;
}

/* --- Stats Bar --- */
.gsta-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    padding: 60px 24px;
    max-width: var(--g-max-w);
    margin: 0 auto;
}

.gsta-stat {
    text-align: center;
    padding: 24px;
}

.gsta-stat-number {
    font-size: 48px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--g-accent), var(--g-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 8px;
}

.gsta-stat-label {
    font-size: 14px;
    color: var(--g-text-dim);
    font-weight: 500;
}

/* --- Benefit Section (dark panel) --- */
.gsta-benefit-panel {
    background: var(--g-surface);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius-lg);
    padding: 48px;
    margin-bottom: 24px;
    display: flex;
    gap: 40px;
    align-items: center;
}

.gsta-benefit-panel.reverse { flex-direction: row-reverse; }

.gsta-benefit-visual {
    flex: 0 0 360px;
    height: 240px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: var(--g-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
}

.gsta-benefit-content { flex: 1; }

.gsta-benefit-content h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--g-white);
}

.gsta-benefit-content p {
    font-size: 15px;
    color: var(--g-text-dim);
    line-height: 1.8;
}

.gsta-benefit-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.gsta-tag {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--g-accent);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* --- CTA Section --- */
.gsta-cta-section {
    text-align: center;
    padding: 80px 24px;
    position: relative;
}

.gsta-cta-section::before {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.gsta-cta-section h2 {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 900;
    margin-bottom: 16px;
}

.gsta-cta-section p {
    font-size: 16px;
    color: var(--g-text-dim);
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Who Section --- */
.gsta-who-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.gsta-who-card {
    background: var(--g-surface);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius);
    padding: 28px;
}

.gsta-who-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--g-white);
    margin-bottom: 8px;
}

.gsta-who-card p {
    font-size: 14px;
    color: var(--g-text-dim);
    line-height: 1.7;
}

/* --- Footer --- */
.gsta-footer {
    border-top: 1px solid var(--g-border);
    padding: 60px 24px 40px;
    margin-top: 40px;
}

.gsta-footer-inner {
    max-width: var(--g-max-w);
    margin: 0 auto;
}

.gsta-footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.gsta-footer-tagline {
    font-size: 14px;
    color: var(--g-text-dim);
    margin-left: 8px;
}

.gsta-footer-links {
    display: flex;
    gap: 64px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

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

.gsta-footer-col h4 {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--g-text-dim);
    margin-bottom: 4px;
}

.gsta-footer-col a {
    color: var(--g-text);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

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

.gsta-footer-bottom p {
    font-size: 13px;
    color: var(--g-text-dim);
}

/* --- Divider --- */
.gsta-divider {
    border: none;
    border-top: 1px solid var(--g-border);
    margin: 0 auto;
    max-width: var(--g-max-w);
}

/* --- UI Mockups --- */
.gsta-mockup {
    background: var(--g-surface);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius);
    overflow: hidden;
    font-size: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.gsta-mockup-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--g-surface-2);
    border-bottom: 1px solid var(--g-border);
}

.gsta-mockup-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
}

.gsta-mockup-dot.red    { background: #ef4444; }
.gsta-mockup-dot.yellow { background: #eab308; }
.gsta-mockup-dot.green  { background: #22c55e; }

.gsta-mockup-bar-title {
    font-size: 11px;
    color: var(--g-text-dim);
    margin-left: 8px;
    font-weight: 600;
}

.gsta-mockup-body {
    padding: 16px;
}

/* Dashboard Mockup */
.mock-dashboard {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 12px;
}

.mock-metric {
    background: var(--g-surface-2);
    border: 1px solid var(--g-border);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
}

.mock-metric-label {
    font-size: 10px;
    color: var(--g-text-dim);
    margin-bottom: 4px;
}

.mock-metric-value {
    font-size: 20px;
    font-weight: 800;
    color: var(--g-white);
    line-height: 1.2;
}

.mock-metric-value.blue   { color: var(--g-accent); }
.mock-metric-value.green  { color: var(--g-green); }
.mock-metric-value.orange { color: var(--g-orange); }
.mock-metric-value.cyan   { color: var(--g-cyan); }
.mock-metric-value.purple { color: var(--g-accent-2); }
.mock-metric-value.red    { color: #ef4444; }

.mock-metric-sub {
    font-size: 9px;
    color: var(--g-text-dim);
    margin-top: 2px;
}

/* Chart Mockup */
.mock-chart {
    background: var(--g-surface-2);
    border: 1px solid var(--g-border);
    border-radius: 8px;
    padding: 12px;
    height: 100px;
    display: flex;
    align-items: flex-end;
    gap: 6px;
}

.mock-bar {
    flex: 1;
    border-radius: 3px 3px 0 0;
    min-height: 8px;
    transition: height 0.3s;
}

.mock-bar.b1 { height: 45%; background: var(--g-accent); }
.mock-bar.b2 { height: 70%; background: var(--g-accent); }
.mock-bar.b3 { height: 55%; background: var(--g-accent); }
.mock-bar.b4 { height: 85%; background: var(--g-green); }
.mock-bar.b5 { height: 65%; background: var(--g-accent); }
.mock-bar.b6 { height: 90%; background: var(--g-green); }
.mock-bar.b7 { height: 40%; background: var(--g-accent); opacity: 0.5; }

/* Chat Mockup */
.mock-chat {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mock-chat-msg {
    max-width: 80%;
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 11px;
    line-height: 1.5;
}

.mock-chat-msg.user {
    align-self: flex-end;
    background: var(--g-accent);
    color: white;
    border-bottom-right-radius: 3px;
}

.mock-chat-msg.bot {
    align-self: flex-start;
    background: var(--g-surface-2);
    color: var(--g-text);
    border: 1px solid var(--g-border);
    border-bottom-left-radius: 3px;
}

.mock-chat-sender {
    font-size: 9px;
    color: var(--g-text-dim);
    margin-bottom: 2px;
}

/* Timelogger Mockup */
.mock-session {
    background: var(--g-surface-2);
    border: 1px solid var(--g-border);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.mock-session-info { display: flex; flex-direction: column; gap: 2px; }
.mock-session-project { font-size: 12px; font-weight: 700; color: var(--g-white); }
.mock-session-detail { font-size: 10px; color: var(--g-text-dim); }

.mock-session-timer {
    font-size: 18px;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--g-green);
}

.mock-session-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 700;
    color: white;
    border: none;
}

.mock-session-btn.active { background: #ef4444; }
.mock-session-btn.start  { background: var(--g-green); }

/* OCR Mockup */
.mock-ocr-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.mock-ocr-step {
    flex: 1;
    background: var(--g-surface-2);
    border: 1px solid var(--g-border);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
}

.mock-ocr-step-icon { font-size: 20px; margin-bottom: 4px; }
.mock-ocr-step-text { font-size: 9px; color: var(--g-text-dim); font-weight: 600; }

.mock-ocr-arrow {
    color: var(--g-accent);
    font-size: 16px;
    flex-shrink: 0;
}

/* Alert Mockup */
.mock-alert {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 8px;
    padding: 10px 12px;
    margin-bottom: 8px;
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.mock-alert.critical {
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.3);
}

.mock-alert-icon { font-size: 14px; flex-shrink: 0; }
.mock-alert-text { font-size: 11px; color: var(--g-text); line-height: 1.5; }
.mock-alert-text strong { color: var(--g-white); }

/* PL Table Mockup */
.mock-pl-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 10px;
}

.mock-pl-table th, .mock-pl-table td {
    padding: 6px 8px;
    border-bottom: 1px solid rgba(51, 65, 85, 0.3);
    text-align: right;
}

.mock-pl-table th {
    color: var(--g-text-dim);
    font-weight: 600;
    text-align: left;
}

.mock-pl-table td { color: var(--g-text); font-variant-numeric: tabular-nums; }
.mock-pl-table .positive { color: var(--g-green); }
.mock-pl-table .negative { color: #ef4444; }
.mock-pl-table .total-row { border-top: 2px solid var(--g-border); font-weight: 700; }
.mock-pl-table .total-row td { color: var(--g-white); }

/* Hero Mockup wrapper */
.gsta-hero-mockup {
    max-width: 680px;
    margin: 48px auto 0;
}

/* ======================================================
   Responsive
   ====================================================== */
@media (max-width: 768px) {
    .gsta-nav {
        display: none;
        position: fixed;
        top: 64px;
        left: 0; right: 0; bottom: 0;
        background: var(--g-bg);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 16px;
        z-index: 999;
    }

    .gsta-nav.is-open { display: flex; }

    .gsta-nav-link { font-size: 18px; padding: 12px 24px; }

    .gsta-menu-btn { display: flex; }

    .gsta-hero { padding: 120px 20px 60px; }

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

    .gsta-benefit-panel {
        flex-direction: column !important;
        padding: 28px;
    }

    .gsta-benefit-visual {
        flex: none;
        width: 100%;
        height: 160px;
        font-size: 48px;
    }

    .gsta-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }

    .gsta-stat-number { font-size: 36px; }

    .gsta-footer-links { gap: 32px; }
}

@media (max-width: 480px) {
    .gsta-hero h1 { font-size: 28px; }

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

    .gsta-btn { justify-content: center; }

    .gsta-stats { grid-template-columns: 1fr; }
}

/* ===== Real Screenshot Frames ===== */
.gsta-phone-frame {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
    border-radius: 28px;
    border: 3px solid var(--g-border);
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0,0,0,0.5), 0 0 40px rgba(59,130,246,0.1);
    background: #0a0a0a;
    display: flex;
    flex-direction: column;
}
.gsta-phone-frame img {
    display: block;
    width: 100%;
    flex: 1;
    object-fit: cover;
    object-position: top;
    min-height: 0;
}
.gsta-phone-frame-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 8px 12px;
    background: linear-gradient(transparent, rgba(0,0,0,0.85));
    font-size: 10px;
    color: var(--g-text-dim);
    text-align: center;
    font-family: var(--g-font-en);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    z-index: 1;
}

.gsta-screenshot-row {
    display: flex;
    gap: 24px;
    justify-content: center;
    align-items: stretch;
    flex-wrap: wrap;
    margin-top: 32px;
}
.gsta-screenshot-row .gsta-phone-frame {
    max-width: 260px;
    flex: 0 0 260px;
}

.gsta-screenshot-wide {
    max-width: 480px;
    margin: 24px auto 0;
    border-radius: 16px;
    border: 2px solid var(--g-border);
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}
.gsta-screenshot-wide img {
    display: block;
    width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .gsta-screenshot-row .gsta-phone-frame {
        max-width: 160px;
        flex: 0 0 160px;
    }
}