/* ============================================================
   PST Recovery Pro Portfolio — Base Styles
   Dark minimal theme
   ============================================================ */

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

:root {
    /* Background */
    --bg-0: #0a0a0f;
    --bg-1: #111118;
    --bg-2: #1a1a24;
    --bg-3: #22222f;
    --bg-4: #2a2a3a;

    /* Text */
    --text-0: #f0f0f5;
    --text-1: #c8c8d8;
    --text-2: #8888a0;
    --text-3: #555568;

    /* Accent */
    --accent: #6c9fff;
    --accent-dim: #4a7adb;
    --accent-glow: rgba(108, 159, 255, 0.12);
    --accent-glow-strong: rgba(108, 159, 255, 0.25);

    /* Status */
    --green: #5ce0a0;
    --yellow: #f0d060;
    --red: #f06070;
    --purple: #b080f0;

    /* Layout */
    --nav-height: 60px;
    --sidebar-width: 280px;
    --max-width: 1100px;
    --radius: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --duration: 0.25s;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-0);
    color: var(--text-1);
    line-height: 1.65;
    overflow-x: hidden;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--duration) var(--ease);
}
a:hover { color: var(--text-0); }

strong { color: var(--text-0); font-weight: 600; }

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

::selection {
    background: var(--accent);
    color: var(--bg-0);
}

/* --- Light Theme --- */
[data-theme="light"] {
    --bg-0: #f5f5f8;
    --bg-1: #eeeef2;
    --bg-2: #ffffff;
    --bg-3: #d8d8e0;
    --bg-4: #c0c0cc;

    --text-0: #111118;
    --text-1: #333345;
    --text-2: #60607a;
    --text-3: #8888a0;

    --accent: #3b6fd9;
    --accent-dim: #2e5bb8;
    --accent-glow: rgba(59, 111, 217, 0.1);
    --accent-glow-strong: rgba(59, 111, 217, 0.2);

    --green: #1a9960;
    --yellow: #b89520;
    --red: #d04050;
    --purple: #7a50c0;
}
[data-theme="light"] .nav {
    background: rgba(245, 245, 248, 0.9);
}
[data-theme="light"] .nav.scrolled {
    background: rgba(245, 245, 248, 0.97);
}
[data-theme="light"] .schedule-field input[type="date"],
[data-theme="light"] .schedule-field input[type="time"] {
    color-scheme: light;
}

/* --- Theme Toggle --- */
.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}
.theme-toggle {
    background: none;
    border: 1px solid var(--bg-3);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: border-color var(--duration) var(--ease),
                background var(--duration) var(--ease);
    padding: 0;
    line-height: 1;
}
.theme-toggle:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}
/* Dark mode: show sun, hide moon */
.theme-icon-light { display: flex; align-items: center; justify-content: center; }
.theme-icon-dark { display: none; }
/* Light mode: show moon, hide sun */
[data-theme="light"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: flex; align-items: center; justify-content: center; }

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

/* --- Nav --- */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-height);
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--duration) var(--ease),
                background var(--duration) var(--ease);
}
.nav.scrolled {
    border-bottom-color: var(--bg-3);
    background: rgba(10, 10, 15, 0.95);
}
.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-0);
    letter-spacing: -0.02em;
}
.logo-bracket { color: var(--accent); }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
    font-size: 0.875rem;
    color: var(--text-2);
    font-weight: 500;
    letter-spacing: 0.01em;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--accent);
    transition: width var(--duration) var(--ease);
}
.nav-links a:hover { color: var(--text-0); }
.nav-links a:hover::after { width: 100%; }

.nav-kb-link {
    color: var(--accent) !important;
    background: var(--accent-glow);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.8rem !important;
    letter-spacing: 0.02em;
    border: 1px solid rgba(108, 159, 255, 0.15);
}
.nav-kb-link:hover {
    background: var(--accent-glow-strong) !important;
    color: var(--text-0) !important;
}
.nav-kb-link::after { display: none !important; }

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 22px; height: 2px;
    background: var(--text-1);
    border-radius: 1px;
    transition: transform var(--duration) var(--ease),
                opacity var(--duration) var(--ease);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--bg-3);
    padding: 16px 24px;
    z-index: 99;
    flex-direction: column;
    gap: 12px;
    transform: translateY(-10px);
    opacity: 0;
    transition: transform var(--duration) var(--ease),
                opacity var(--duration) var(--ease);
}
.mobile-menu.open {
    display: flex;
    transform: translateY(0);
    opacity: 1;
}
.mobile-menu a {
    font-size: 1rem;
    color: var(--text-1);
    padding: 8px 0;
    border-bottom: 1px solid var(--bg-3);
}
.mobile-menu a:last-child { border-bottom: none; }

/* --- Sections --- */
.section {
    padding: 100px 0;
}
.section-alt {
    background: var(--bg-1);
}
.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-0);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}
.title-number {
    color: var(--accent);
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 1rem;
    font-weight: 400;
    margin-right: 8px;
}
.section-subtitle {
    color: var(--text-2);
    margin-bottom: 40px;
    font-size: 1rem;
}

/* --- Footer --- */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--bg-3);
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-3);
}
.footer-kb {
    color: var(--text-2);
    font-size: 0.85rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    border: none;
    font-family: inherit;
}
.btn-primary {
    background: var(--accent);
    color: var(--bg-0);
}
.btn-primary:hover {
    background: var(--text-0);
    color: var(--bg-0);
    transform: translateY(-1px);
    box-shadow: 0 8px 30px rgba(108, 159, 255, 0.2);
}
.btn-ghost {
    background: transparent;
    color: var(--text-1);
    border: 1px solid var(--bg-4);
}
.btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }
    .section { padding: 64px 0; }
    .section-title { font-size: 1.4rem; }
    .container { padding: 0 16px; }

    /* Mobile menu: bigger touch targets */
    .mobile-menu { padding: 20px 24px; gap: 4px; }
    .mobile-menu a { padding: 14px 0; font-size: 1.05rem; }

    /* Buttons: meet 48px min tap target */
    .btn {
        padding: 14px 28px;
        font-size: 1rem;
        min-height: 48px;
        justify-content: center;
        width: 100%;
        text-align: center;
    }

    /* Footer stacks on mobile */
    .footer-inner {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 380px) {
    .container { padding: 0 12px; }
    .nav-inner { padding: 0 12px; }
    .nav-logo { font-size: 1.1rem; }
}