/* ========================================
   PlanningHUB Design System
   Unified design tokens & base components
   ======================================== */

/* --- Design Tokens --- */
:root {
    /* Background */
    --ph-bg: #08080d;
    --ph-bg-surface: rgba(255, 255, 255, 0.03);
    --ph-bg-surface-hover: rgba(255, 255, 255, 0.06);
    --ph-bg-surface-active: rgba(255, 255, 255, 0.09);

    /* Brand Colors */
    --ph-mint: #5CC6C3;
    --ph-mint-light: #6DD8D5;
    --ph-mint-glow: rgba(92, 198, 195, 0.4);
    --ph-mint-subtle: rgba(92, 198, 195, 0.15);

    --ph-purple: #8B6FA8;
    --ph-purple-light: #A080C4;
    --ph-purple-glow: rgba(139, 111, 168, 0.4);
    --ph-purple-subtle: rgba(139, 111, 168, 0.15);

    /* Text */
    --ph-text: #F0F0F5;
    --ph-text-muted: rgba(240, 240, 245, 0.5);
    --ph-text-subtle: rgba(240, 240, 245, 0.35);

    /* Border */
    --ph-border: rgba(255, 255, 255, 0.08);
    --ph-border-hover: rgba(255, 255, 255, 0.15);

    /* Semantic */
    --ph-error: #f87171;
    --ph-success: #10b981;
    --ph-warning: #fbbf24;

    /* Typography */
    --ph-font-display: 'Instrument Serif', Georgia, serif;
    --ph-font-body: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --ph-space-xs: 0.25rem;
    --ph-space-sm: 0.5rem;
    --ph-space-md: 1rem;
    --ph-space-lg: 1.5rem;
    --ph-space-xl: 2rem;
    --ph-space-2xl: 3rem;
    --ph-space-3xl: 4rem;

    /* Radius */
    --ph-radius-sm: 8px;
    --ph-radius-md: 12px;
    --ph-radius-lg: 20px;
    --ph-radius-xl: 24px;
    --ph-radius-full: 100px;

    /* Shadows */
    --ph-shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.3);
    --ph-shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.4);
    --ph-shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --ph-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ph-duration: 0.3s;

    /* Glass tokens */
    --ph-glass-bg: rgba(255, 255, 255, 0.05);
    --ph-glass-bg-hover: rgba(255, 255, 255, 0.08);
    --ph-glass-border: rgba(255, 255, 255, 0.08);
    --ph-glass-blur: blur(12px) saturate(180%);
    --ph-shadow-glass: 0 8px 32px -8px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.06);
    --ph-shadow-glass-hover: 0 20px 60px -15px rgba(0,0,0,0.5), 0 0 30px -10px var(--ph-mint-glow);

    /* Backward compat aliases (used by existing pages) */
    --color-bg: var(--ph-bg);
    --color-surface: var(--ph-bg-surface);
    --color-surface-hover: var(--ph-bg-surface-hover);
    --color-border: var(--ph-border);
    --color-border-hover: var(--ph-border-hover);
    --color-text: var(--ph-text);
    --color-text-muted: var(--ph-text-muted);
    --color-text-subtle: var(--ph-text-subtle);
    --color-accent-1: var(--ph-purple);
    --color-accent-2: var(--ph-mint);
    --color-accent-3: var(--ph-purple);
    --color-error: var(--ph-error);
    --color-success: var(--ph-success);
    --font-display: var(--ph-font-display);
    --font-body: var(--ph-font-body);
}

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

body {
    font-family: var(--ph-font-body);
    background-color: var(--ph-bg);
    color: var(--ph-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

/* --- Utility --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--ph-space-lg);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Buttons --- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--ph-font-body);
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--ph-mint), var(--ph-purple));
    border: none;
    border-radius: var(--ph-radius-md);
    cursor: pointer;
    transition: all var(--ph-duration) var(--ph-ease);
}

.btn-primary:hover {
    box-shadow: 0 8px 25px -8px var(--ph-mint-glow);
    transform: translateY(-2px);
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    font-family: var(--ph-font-body);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--ph-text-muted);
    background: var(--ph-bg-surface);
    border: 1px solid var(--ph-border);
    border-radius: var(--ph-radius-full);
    backdrop-filter: blur(10px);
    cursor: pointer;
    transition: all var(--ph-duration) ease;
}

.btn-ghost:hover {
    color: var(--ph-text);
    background: var(--ph-bg-surface-hover);
    border-color: var(--ph-border-hover);
}

/* --- Fixed Navbar --- */
.ph-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: rgba(8, 8, 13, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--ph-border);
    transition: background var(--ph-duration) ease;
}

.ph-navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.ph-navbar-logo svg {
    height: 28px;
    width: auto;
}

.ph-navbar-logo span {
    font-family: var(--ph-font-display);
    font-size: 1.2rem;
    color: var(--ph-text);
    font-style: italic;
}

.ph-navbar-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* --- Cards --- */
.ph-card {
    position: relative;
    background: var(--ph-bg-surface);
    border: 1px solid var(--ph-border);
    border-radius: var(--ph-radius-lg);
    padding: var(--ph-space-xl);
    transition: all 0.4s var(--ph-ease);
    overflow: hidden;
}

.ph-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--ph-mint), var(--ph-purple));
    opacity: 0;
    transition: opacity 0.4s ease;
}

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

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

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}