/* ============================================================
   SkyRecover OCC Platform - Core Design System
   Version: 1.0.0
   ============================================================ */

/* ---- CSS Custom Properties (Design Tokens) ---- */
:root {
    /* Color System - Dark Theme (Default) */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1e293b;
    --color-bg-quaternary: #334155;
    --color-bg-elevated: rgba(30, 41, 59, 0.85);
    --color-bg-glass: rgba(17, 24, 39, 0.75);

    /* Accent Colors */
    --color-accent-blue: #3b82f6;
    --color-accent-blue-hover: #2563eb;
    --color-accent-blue-glow: rgba(59, 130, 246, 0.3);
    --color-accent-green: #10b981;
    --color-accent-green-hover: #059669;
    --color-accent-green-glow: rgba(16, 185, 129, 0.3);
    --color-accent-amber: #f59e0b;
    --color-accent-amber-hover: #d97706;
    --color-accent-amber-glow: rgba(245, 158, 11, 0.3);
    --color-accent-red: #ef4444;
    --color-accent-red-hover: #dc2626;
    --color-accent-red-glow: rgba(239, 68, 68, 0.3);
    --color-accent-purple: #8b5cf6;
    --color-accent-cyan: #06b6d4;
    --color-accent-pink: #ec4899;

    /* Text Colors */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    --color-text-muted: #64748b;
    --color-text-disabled: #475569;
    --color-text-inverse: #0f172a;

    /* Border Colors */
    --color-border-primary: rgba(148, 163, 184, 0.15);
    --color-border-secondary: rgba(148, 163, 184, 0.08);
    --color-border-focus: var(--color-accent-blue);
    --color-border-error: var(--color-accent-red);

    /* Status Colors */
    --color-status-critical: #ef4444;
    --color-status-warning: #f59e0b;
    --color-status-info: #3b82f6;
    --color-status-success: #10b981;
    --color-status-neutral: #64748b;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

    /* Type Scale */
    --text-xs: 0.6875rem;    /* 11px */
    --text-sm: 0.75rem;      /* 12px */
    --text-base: 0.8125rem;  /* 13px */
    --text-md: 0.875rem;     /* 14px */
    --text-lg: 1rem;         /* 16px */
    --text-xl: 1.125rem;     /* 18px */
    --text-2xl: 1.375rem;    /* 22px */
    --text-3xl: 1.75rem;     /* 28px */
    --text-4xl: 2rem;        /* 32px */

    /* Line Heights */
    --leading-tight: 1.2;
    --leading-normal: 1.5;
    --leading-relaxed: 1.7;

    /* Font Weights */
    --weight-light: 300;
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;

    /* Spacing (4px base unit) */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */

    /* Border Radius */
    --radius-xs: 2px;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow-blue: 0 0 20px var(--color-accent-blue-glow);
    --shadow-glow-green: 0 0 20px var(--color-accent-green-glow);
    --shadow-glow-red: 0 0 20px var(--color-accent-red-glow);
    --shadow-glow-amber: 0 0 20px var(--color-accent-amber-glow);

    /* Transitions */
    --transition-fast: 100ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 350ms ease;
    --transition-spring: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Z-Index Scale */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-drawer: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-toast: 600;
    --z-alert: 700;

    /* Layout */
    --nav-width: 240px;
    --right-panel-width: 320px;
    --header-height: 56px;
    --content-max-width: 1600px;

    /* Glassmorphism */
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(148, 163, 184, 0.12);
    --glass-blur: 12px;
}

/* ---- Light Theme Override ---- */
[data-theme="light"] {
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-quaternary: #e2e8f0;
    --color-bg-elevated: rgba(255, 255, 255, 0.9);
    --color-bg-glass: rgba(255, 255, 255, 0.8);

    --color-text-primary: #0f172a;
    --color-text-secondary: #334155;
    --color-text-tertiary: #64748b;
    --color-text-muted: #94a3b8;
    --color-text-disabled: #cbd5e1;
    --color-text-inverse: #f8fafc;

    --color-border-primary: rgba(15, 23, 42, 0.12);
    --color-border-secondary: rgba(15, 23, 42, 0.06);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(15, 23, 42, 0.08);
}

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--weight-normal);
    line-height: var(--leading-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

/* ---- Scrollbar Styling ---- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--color-bg-quaternary);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-bg-quaternary) transparent;
}

/* ---- Skip Navigation ---- */
.skip-nav {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-accent-blue);
    color: white;
    padding: var(--space-2) var(--space-4);
    z-index: var(--z-alert);
    font-weight: var(--weight-semibold);
    border-radius: 0 0 var(--radius-md) 0;
    transition: top var(--transition-fast);
}
.skip-nav:focus {
    top: 0;
}

/* ---- Alert Banner ---- */
.alert-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-alert);
    background: linear-gradient(90deg, var(--color-accent-red), #b91c1c);
    color: white;
    padding: var(--space-2) var(--space-4);
    transform: translateY(0);
    transition: transform var(--transition-normal);
}
.alert-banner.hidden {
    transform: translateY(-100%);
    pointer-events: none;
}
.alert-banner__content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    max-width: var(--content-max-width);
    margin: 0 auto;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
}
.alert-banner__dismiss {
    margin-left: auto;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--space-1);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}
.alert-banner__dismiss:hover {
    opacity: 1;
}

/* ---- Application Shell ---- */
.app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* ---- Header ---- */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-4);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-primary);
    flex-shrink: 0;
    z-index: var(--z-sticky);
}

.app-header__left {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.app-header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-purple));
    border-radius: var(--radius-lg);
    color: white;
    font-size: var(--text-lg);
}

.logo-text__primary {
    display: block;
    font-size: var(--text-md);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    letter-spacing: -0.3px;
}
.logo-text__secondary {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.app-header__event-badge {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.event-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.4);
    border-radius: var(--radius-sm);
    color: var(--color-accent-red);
    font-size: var(--text-xs);
    font-weight: var(--weight-bold);
    letter-spacing: 0.5px;
}

.event-badge__label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: var(--weight-medium);
}

.app-header__center {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.header-clock {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-mono);
    font-size: var(--text-md);
    font-weight: var(--weight-semibold);
    color: var(--color-accent-cyan);
}
.header-clock i {
    font-size: var(--text-sm);
    opacity: 0.7;
}

.header-event-timer {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.event-timer__label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
}
.event-timer__value {
    font-family: var(--font-mono);
    font-size: var(--text-md);
    font-weight: var(--weight-semibold);
    color: var(--color-accent-amber);
}

.app-header__right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--text-sm);
}
.header-btn:hover {
    background: var(--color-bg-quaternary);
    color: var(--color-text-primary);
    border-color: var(--color-border-focus);
}
.header-btn:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

.header-user {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: var(--space-2);
    padding-left: var(--space-3);
    border-left: 1px solid var(--color-border-primary);
}
.header-user__avatar {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-blue);
    border-radius: var(--radius-full);
    color: white;
    font-size: var(--text-xs);
    font-weight: var(--weight-bold);
}
.header-user__name {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: var(--weight-medium);
}

/* ---- Main Layout ---- */
.app-layout {
    display: grid;
    grid-template-columns: var(--nav-width) 1fr var(--right-panel-width);
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

/* ---- Navigation Panel ---- */
.nav-panel {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border-primary);
    overflow-y: auto;
    overflow-x: hidden;
}

.nav-section {
    padding: var(--space-3) var(--space-3);
}
.nav-section:first-child {
    padding-top: var(--space-4);
}
.nav-section--bottom {
    margin-top: auto;
    padding: var(--space-4) var(--space-3);
    border-top: 1px solid var(--color-border-primary);
}

.nav-section__title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 0 var(--space-2);
    margin-bottom: var(--space-2);
}

.nav-section__count {
    background: var(--color-accent-red);
    color: white;
    font-size: 10px;
    font-weight: var(--weight-bold);
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
}

/* Nav Menu */
.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.nav-item i {
    width: 18px;
    text-align: center;
    font-size: var(--text-sm);
    flex-shrink: 0;
}
.nav-item:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
}
.nav-item.active {
    background: rgba(59, 130, 246, 0.12);
    color: var(--color-accent-blue);
    font-weight: var(--weight-semibold);
}
.nav-item.active i {
    color: var(--color-accent-blue);
}
.nav-item:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: -2px;
}

/* Flight List */
.flight-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.flight-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.flight-card:hover {
    background: var(--color-bg-quaternary);
    border-color: var(--color-border-primary);
}
.flight-card.active {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--color-accent-blue);
    box-shadow: var(--shadow-glow-blue);
}
.flight-card:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

.flight-card__status {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}
.flight-card__status--ground {
    background: var(--color-accent-green);
    box-shadow: 0 0 6px var(--color-accent-green-glow);
}
.flight-card__status--approach {
    background: var(--color-accent-amber);
    box-shadow: 0 0 6px var(--color-accent-amber-glow);
}
.flight-card__status--holding {
    background: var(--color-accent-red);
    animation: pulse-glow 2s ease-in-out infinite;
}

.flight-card__info {
    flex: 1;
    min-width: 0;
}
.flight-card__callsign {
    font-size: var(--text-sm);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    font-family: var(--font-mono);
}
.flight-card__route {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: 1px;
}

.flight-card__pax {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-align: right;
}
.flight-card__pax-count {
    font-weight: var(--weight-semibold);
    color: var(--color-text-secondary);
}

/* ---- Main Content ---- */
.main-content {
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--color-bg-primary);
    position: relative;
}

.view-container {
    padding: var(--space-4);
    min-height: 100%;
}

/* ---- Right Panel ---- */
.right-panel {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border-primary);
    overflow: hidden;
}

.context-panel {
    border-bottom: 1px solid var(--color-border-primary);
    max-height: 40%;
    overflow-y: auto;
}
.context-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-secondary);
    position: sticky;
    top: 0;
    background: var(--color-bg-secondary);
}
.context-panel__header h3 {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-text-secondary);
}
.context-panel__body {
    padding: var(--space-3) var(--space-4);
}

.audit-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.audit-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-secondary);
    flex-shrink: 0;
}
.audit-panel__header h3 {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.audit-panel__header h3 i {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}
.audit-panel__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.audit-panel__body {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2) var(--space-3);
}

/* ---- Utility Classes ---- */
.hidden {
    display: none !important;
}
.invisible {
    visibility: hidden;
}
.text-muted {
    color: var(--color-text-muted);
}
.text-center {
    text-align: center;
}
.font-mono {
    font-family: var(--font-mono);
}

/* ---- Responsive ---- */
@media (max-width: 1440px) {
    :root {
        --right-panel-width: 280px;
    }
}
@media (max-width: 1280px) {
    .app-layout {
        grid-template-columns: var(--nav-width) 1fr;
    }
    .right-panel {
        display: none;
    }
}
@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
    .nav-panel {
        display: none;
    }
}

/* ---- Print ---- */
@media print {
    .app-header, .nav-panel, .right-panel, .toast-container {
        display: none !important;
    }
    .app-layout {
        grid-template-columns: 1fr;
    }
    .main-content {
        overflow: visible;
    }
    body {
        overflow: visible;
        height: auto;
    }
}
/* ============================================================
   Phase 9 – Accessibility & Polish
   ============================================================ */

/* Focus-visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-border-focus, #60a5fa);
    outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (forced-colors: active) {
    .badge, .btn, .kpi-card, .toast {
        border: 1px solid CanvasText;
    }
}

/* Print styles */
@media print {
    .app-header, .nav-panel, .right-panel, .toast-container, .modal-overlay {
        display: none !important;
    }
    .main-content {
        margin: 0;
        padding: 1cm;
    }
    .app-layout {
        display: block;
    }
    * {
        color: black !important;
        background: white !important;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--color-border-primary, #334155);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted, #64748b);
}

/* Selection styling */
::selection {
    background: rgba(59, 130, 246, 0.3);
    color: var(--color-text-primary);
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Performance: GPU layers for animated elements */
.pulse-glow, .toast, .modal-content, .drawer {
    will-change: transform, opacity;
}