/* ===== Case Study Styles ===== */
/* Builds on design tokens from styles.css */

/* ===== Nav ===== */
.cs-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 24px 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.4s ease, border-color 0.4s ease;
    border-bottom: 1px solid transparent;
}
.cs-nav.scrolled {
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(20px);
    border-color: var(--border);
}
[data-theme="light"] .cs-nav.scrolled {
    background: rgba(245, 245, 240, 0.9);
}
.cs-back {
    display: flex; align-items: center; gap: 10px;
    font-size: 0.85rem; font-weight: 500;
    color: #fff; text-decoration: none;
    opacity: 0.75; transition: opacity 0.25s;
}
.cs-back:hover { opacity: 1; }
.cs-nav.scrolled .cs-back { color: var(--text); }
.cs-nav-logo {
    font-family: var(--font-heading);
    font-size: 1.2rem; font-weight: 700;
    color: #fff; text-decoration: none;
    letter-spacing: 0.02em;
}
.cs-nav.scrolled .cs-nav-logo { color: var(--text); }
.cs-nav-logo .accent { color: var(--accent); }
.cs-nav-right { display: flex; align-items: center; gap: 16px; }
.theme-toggle-cs {
    background: none; border: 1px solid rgba(255,255,255,0.25);
    border-radius: 50%; width: 38px; height: 38px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: #fff; transition: all 0.25s;
    position: relative;
}
.cs-nav.scrolled .theme-toggle-cs { border-color: var(--border); color: var(--text); }
.theme-toggle-cs:hover { border-color: var(--accent); color: var(--accent); }

.theme-toggle-cs .icon-sun,
.theme-toggle-cs .icon-moon {
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.theme-toggle-cs .icon-sun {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}
.theme-toggle-cs .icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}
[data-theme="light"] .theme-toggle-cs .icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}
[data-theme="light"] .theme-toggle-cs .icon-moon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

/* ===== Hero ===== */
.cs-hero {
    height: 100vh; min-height: 680px;
    display: flex; flex-direction: column; justify-content: flex-end;
    padding: 0 80px 100px;
    position: relative; overflow: hidden;
}
.cs-hero-bg {
    position: absolute; inset: 0; z-index: 0;
}
.cs-hero-overlay {
    position: absolute; inset: 0; z-index: 1;
    background: linear-gradient(to top, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.1) 60%, transparent 100%);
}
.cs-hero-content { position: relative; z-index: 2; }
.cs-tags { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; }
.cs-tag {
    font-size: 0.68rem; font-weight: 600;
    letter-spacing: 0.12em; text-transform: uppercase;
    padding: 6px 16px; border: 1px solid rgba(255,255,255,0.35);
    border-radius: 100px; color: rgba(255,255,255,0.85);
    backdrop-filter: blur(8px); background: rgba(255,255,255,0.08);
}
.cs-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(3rem, 7.5vw, 8rem);
    font-weight: 700; line-height: 0.88;
    text-transform: uppercase; color: #fff;
    margin-bottom: 36px; letter-spacing: -0.01em;
}
.cs-hero-desc {
    font-size: 1.05rem; line-height: 1.75;
    color: rgba(255,255,255,0.65); max-width: 480px;
}

/* ===== Meta Strip ===== */
.cs-meta { background: var(--bg-secondary); border-bottom: 1px solid var(--border); }
.cs-meta-inner {
    max-width: 1280px; margin: 0 auto; padding: 28px 80px;
    display: flex;
}
.cs-meta-item {
    flex: 1; display: flex; flex-direction: column; gap: 8px;
    padding-right: 40px; border-right: 1px solid var(--border); margin-right: 40px;
}
.cs-meta-item:last-child { border-right: none; margin-right: 0; padding-right: 0; }
.cs-meta-label {
    font-size: 0.65rem; font-weight: 600;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--text-secondary);
}
.cs-meta-value { font-size: 0.95rem; font-weight: 500; color: var(--text); }

/* ===== Hero Mockup Display ===== */
.cs-hero-mockup {
    background: var(--bg);
    padding: 48px 80px;
    display: flex; justify-content: center; align-items: flex-end;
    gap: 24px; overflow: hidden; position: relative;
    border-bottom: 1px solid var(--border);
}

/* ===== Phone Frame ===== */
.phone-mockup { flex-shrink: 0; position: relative; }
.phone-mockup.main { width: 200px; }
.phone-mockup.side { width: 160px; opacity: 0.7; transform: translateY(30px); }
.phone-mockup.side-far { width: 140px; opacity: 0.4; transform: translateY(55px); }
.phone-frame {
    background: #111; border-radius: 36px; padding: 10px;
    box-shadow: 0 0 0 1px rgba(255,255,255,0.1), 0 40px 100px rgba(0,0,0,0.5);
}
.phone-screen {
    border-radius: 28px; overflow: hidden;
    aspect-ratio: 9/19.5; position: relative;
    background: #0a0a0a;
}
.phone-notch {
    position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: 70px; height: 24px;
    background: #111; border-radius: 0 0 14px 14px; z-index: 10;
}

/* ===== Browser Frame ===== */
.browser-mockup {
    background: var(--bg-card); border-radius: 12px;
    overflow: hidden; border: 1px solid var(--border);
    box-shadow: 0 40px 100px rgba(0,0,0,0.35); width: 100%; max-width: 900px;
}
.browser-bar {
    background: var(--bg-secondary); padding: 10px 18px;
    display: flex; align-items: center; gap: 14px;
    border-bottom: 1px solid var(--border);
}
.browser-dots { display: flex; gap: 6px; }
.browser-dot { width: 10px; height: 10px; border-radius: 50%; }
.browser-dot:nth-child(1) { background: #ff5f57; }
.browser-dot:nth-child(2) { background: #febc2e; }
.browser-dot:nth-child(3) { background: #28c840; }
.browser-url {
    flex: 1; background: var(--bg); border-radius: 6px;
    padding: 5px 14px; font-size: 0.72rem; color: var(--text-secondary);
}

/* ===== Sections ===== */
.cs-container { max-width: 1280px; margin: 0 auto; padding: 0 80px; }
.cs-section { padding: 64px 0; border-bottom: 1px solid var(--border); }
.cs-section:last-child { border-bottom: none; }

.cs-label {
    display: flex; align-items: center; gap: 14px;
    font-size: 0.68rem; font-weight: 600;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--accent); margin-bottom: 20px;
}
.cs-label::before {
    content: ''; display: block; width: 28px; height: 1px;
    background: var(--accent); flex-shrink: 0;
}
.cs-title {
    font-family: var(--font-heading);
    font-size: clamp(2.2rem, 4vw, 3.5rem);
    font-weight: 700; text-transform: uppercase;
    line-height: 0.95; color: var(--text);
    margin-bottom: 28px; letter-spacing: -0.01em;
}
.cs-body {
    font-size: 1.05rem; line-height: 1.85;
    color: var(--text-secondary); max-width: 660px;
}
.cs-two-col {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 80px; align-items: start;
}

/* ===== Process ===== */
.cs-process {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 1px; background: var(--border);
    border: 1px solid var(--border);
    border-radius: 16px; overflow: hidden; margin-top: 56px;
}
.cs-step { background: var(--bg-card); padding: 40px 32px; }
.cs-step-num {
    font-family: var(--font-heading); font-size: 3.5rem;
    font-weight: 700; color: rgba(255,255,255,0.04);
    line-height: 1; margin-bottom: 20px;
}
[data-theme="light"] .cs-step-num { color: rgba(0,0,0,0.05); }
.cs-step-icon {
    width: 40px; height: 40px; border-radius: 10px;
    background: var(--accent); display: flex; align-items: center;
    justify-content: center; margin-bottom: 16px;
    color: #000;
}
.cs-step-title {
    font-family: var(--font-heading); font-size: 1.15rem;
    font-weight: 700; text-transform: uppercase;
    color: var(--text); margin-bottom: 10px; letter-spacing: 0.02em;
}
.cs-step-body { font-size: 0.875rem; line-height: 1.7; color: var(--text-secondary); }

/* ===== Features ===== */
.cs-features {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 20px; margin-top: 56px;
}
.cs-feature {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 16px; overflow: hidden;
    transition: border-color 0.3s ease;
}
.cs-feature:hover { border-color: var(--border-hover); }
.cs-feature-screen {
    width: 100%; aspect-ratio: 16/9;
    position: relative; overflow: hidden;
}
.cs-feature-body { padding: 24px 28px; }
.cs-feature-title {
    font-family: var(--font-heading); font-size: 1.05rem;
    font-weight: 700; text-transform: uppercase;
    color: var(--text); margin-bottom: 6px; letter-spacing: 0.02em;
}
.cs-feature-desc { font-size: 0.875rem; line-height: 1.65; color: var(--text-secondary); }

/* ===== Outcome Stats ===== */
.cs-stats {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 20px; margin-top: 56px;
}
.cs-stat {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 16px; padding: 48px 36px; text-align: center;
}
.cs-stat-number {
    font-family: var(--font-heading); font-size: 3.5rem;
    font-weight: 700; color: var(--accent);
    line-height: 1; margin-bottom: 12px;
}
.cs-stat-label { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; }

/* ===== Next Project ===== */
.cs-next { padding: 72px 0; text-align: center; }
.cs-next-label {
    font-size: 0.68rem; font-weight: 600;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--text-secondary); margin-bottom: 24px;
}
.cs-next-link {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 6rem);
    font-weight: 700; text-transform: uppercase;
    color: var(--text); text-decoration: none;
    display: inline-flex; align-items: center; gap: 24px;
    transition: color 0.3s ease; line-height: 1;
}
.cs-next-link:hover { color: var(--accent); }
.cs-next-link svg { transition: transform 0.3s ease; }
.cs-next-link:hover svg { transform: translate(6px, -6px); }

/* ===== Footer ===== */
.cs-footer {
    padding: 36px 80px;
    border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
}
.cs-footer-copy { font-size: 0.85rem; color: var(--text-secondary); }
.cs-footer-logo {
    font-family: var(--font-heading); font-size: 1.1rem;
    font-weight: 700; color: var(--text); text-decoration: none;
}
.cs-footer-logo .accent { color: var(--accent); }

/* ===== Waveform SVG ===== */
.waveform-svg { width: 100%; height: 100%; }

/* ===== Mobile Responsive ===== */
@media (max-width: 900px) {
    .cs-nav { padding: 20px 24px; }
    .cs-hero { padding: 0 24px 80px; }
    .cs-meta-inner { padding: 32px 24px; flex-wrap: wrap; gap: 0; }
    .cs-meta-item {
        min-width: 45%; border-right: none; margin-right: 0;
        padding-right: 0; padding-bottom: 24px; margin-bottom: 24px;
        border-bottom: 1px solid var(--border);
    }
    .cs-meta-item:nth-child(3), .cs-meta-item:nth-child(4) { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
    .cs-container { padding: 0 24px; }
    .cs-section { padding: 44px 0; }
    .cs-two-col { grid-template-columns: 1fr; gap: 32px; }
    .cs-process { grid-template-columns: 1fr 1fr; }
    .cs-features { grid-template-columns: 1fr; }
    .cs-stats { grid-template-columns: 1fr; gap: 12px; }
    .cs-hero-mockup { padding: 48px 24px; gap: 16px; }
    .phone-mockup.main { width: 150px; }
    .phone-mockup.side { width: 120px; }
    .phone-mockup.side-far { width: 100px; }
    .cs-footer { padding: 28px 24px; flex-direction: column; gap: 16px; text-align: center; }
    .cs-next { padding: 56px 0; }
}
@media (max-width: 540px) {
    .cs-process { grid-template-columns: 1fr; }
    .cs-hero-title { font-size: 2.8rem; }
    .phone-mockup.side-far { display: none; }
}