/* ==========================================================================
   base.css -- Design Tokens, Reset, Typography, Layout, Utilities
   Consolidated from styles.css (Phases 1-2)
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
    /* Color Palette - Australia Awards Theme */
    --color-primary-navy: #002B51;
    --color-primary-blue: #0079A3;
    --color-accent-teal: #3CB6CE;
    --color-bright-cyan: #00BDDD;
    --color-bg-light: #C8E9F1;
    --color-bg-white: #ffffff;
    --color-bg-gray: #f2f2f2;
    --color-bg-offwhite: #F4F4F8;

    /* Semantic Colors */
    --color-success: #2E7D32;
    --color-error: #C62828;
    --color-warning: #F57C00;
    --color-info: #0079A3;

    /* Text Colors */
    --color-text-primary: #002B51;
    --color-text-secondary: #5B5B63;
    --color-text-light: #ffffff;
    --color-text-muted: #6c757d;

    /* Spacing Scale (8px base unit) */
    --space-xs: 0.25rem;   /* 4px */
    --space-sm: 0.5rem;    /* 8px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.5rem;    /* 24px */
    --space-xl: 2rem;      /* 32px */
    --space-2xl: 3rem;     /* 48px */
    --space-3xl: 4rem;     /* 64px */

    /* Typography Scale */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    /* Font Families */
    --font-family-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.75;

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 600ms ease;

    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;

    /* Layout */
    --header-height: 100px;
    --footer-height: 90px;
    --container-max-width: 1200px;
}

/* ==========================================================================
   2. CSS Reset & Base Styles
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg-light);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==========================================================================
   3. Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: var(--space-md);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-top: 0;
    margin-bottom: var(--space-md);
}

/* Fluid Typography */
@media (min-width: 768px) {
    html {
        font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    }
}

/* ==========================================================================
   4. Layout Components
   ========================================================================== */

/* Header */
.header {
    background-color: var(--color-primary-navy);
    color: var(--color-text-light);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex: 1;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo {
    display: block;
    height: 60px;
    width: 180px;
    object-fit: contain;
}

/* Header Search */
.header-search {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex: 0 0 auto;
    margin-left: auto;
}

.search-container {
    display: flex;
    gap: var(--space-sm);
    width: 100%;
    max-width: 400px;
}

.search-container input[type="text"] {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--color-accent-teal);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
}

.search-container input[type="submit"] {
    padding: var(--space-sm) var(--space-lg);
    background-color: var(--color-accent-teal);
    color: var(--color-text-light);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-base);
}

.search-container input[type="submit"]:hover {
    background-color: var(--color-primary-navy);
}

/* Timer Display */
.timer-container {
    background-color: var(--color-bg-offwhite);
    border-radius: var(--radius-full);
    padding: var(--space-sm) var(--space-md);
    box-shadow: var(--shadow-sm);
}

#timerDisplay {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-family: var(--font-family-mono);
}

/* Main Content Container */
.container {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-lg);
    max-width: var(--container-max-width);
    width: 95%;
    margin: var(--space-2xl) auto var(--space-lg);
    padding-top: calc(var(--header-height) + var(--space-lg));
}

.container-enc {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    max-width: var(--container-max-width);
    width: 95%;
    margin: var(--space-3xl) auto var(--space-xl);
}

/* Admin Container */
.admin-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    max-width: 100%;
    margin: auto;
    background-color: var(--color-bg-light);
    padding: var(--space-lg);
    padding-top: calc(var(--header-height) + var(--space-lg));
    padding-bottom: calc(var(--footer-height) + var(--space-lg));
    min-height: 100vh;
    overflow-x: auto;
}

/* User Management Container */
.user-management-container {
    width: 90%;
    max-width: var(--container-max-width);
    margin: var(--space-2xl) auto;
    padding: var(--space-lg);
    padding-top: calc(var(--header-height) + var(--space-lg));
    padding-bottom: calc(var(--footer-height) + var(--space-lg));
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow-x: auto;
}

.user-management-title {
    text-align: center;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

/* Horizontal Menu */
.horizontal-menu {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background-color: var(--color-bg-white);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.menu-item {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.menu-item:hover {
    background-color: var(--color-bg-light);
    color: var(--color-primary-navy);
}

.menu-item.logout {
    color: var(--color-error);
}

.menu-item.logout:hover {
    background-color: var(--color-error);
    color: var(--color-text-light);
}

/* Tile Navigation */
.tile-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-xl);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    background-color: var(--color-primary-blue);
    color: var(--color-text-light);
    border-radius: var(--radius-lg);
    text-decoration: none;
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    min-height: 200px;
}

.tile h3 {
    margin: 0;
    color: var(--color-text-light);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

.tile:hover {
    transform: translateY(-5px);
    background-color: var(--color-primary-navy);
    box-shadow: var(--shadow-lg);
}

.disabled-tile {
    background-color: var(--color-bg-gray) !important;
    color: var(--color-text-muted) !important;
    cursor: not-allowed;
    pointer-events: none;
}

.disabled-tile h3 {
    color: var(--color-text-muted) !important;
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: var(--footer-height);
    background-color: var(--color-primary-navy);
    color: var(--color-text-light);
    z-index: var(--z-fixed);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

/* ==========================================================================
   5. Responsive Breakpoints (Mobile-First)
   ========================================================================== */

@media (min-width: 576px) {
    .container {
        width: 90%;
    }

    .login-container {
        width: 80%;
    }

    .button-group {
        flex-wrap: nowrap;
    }
}

@media (min-width: 768px) {
    .header {
        padding: var(--space-lg) var(--space-xl);
    }

    .container {
        width: 85%;
        gap: var(--space-xl);
    }

    .container-enc {
        width: 85%;
    }

    .admin-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .user-management-container {
        width: 85%;
    }

    .login-container {
        width: 60%;
        padding: var(--space-2xl);
    }

    .outcomes-table {
        grid-template-columns: repeat(8, 1fr);
    }

    .burger-menu-items {
        min-width: 250px;
    }
}

@media (min-width: 992px) {
    .container {
        width: 80%;
        max-width: var(--container-max-width);
    }

    .admin-container {
        grid-template-columns: repeat(3, 1fr);
    }

    .user-management-container {
        width: 80%;
    }

    .login-container {
        width: 500px;
    }

    .search-container {
        max-width: 500px;
    }
}

@media (min-width: 1200px) {
    .container {
        width: 75%;
    }

    .user-management-container {
        width: 75%;
    }
}

/* ==========================================================================
   6. Utility Classes
   ========================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-xs); }
.p-2 { padding: var(--space-sm); }
.p-3 { padding: var(--space-md); }
.p-4 { padding: var(--space-lg); }
.p-5 { padding: var(--space-xl); }

.d-flex { display: flex; }
.d-grid { display: grid; }
.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: var(--space-xs); }
.gap-2 { gap: var(--space-sm); }
.gap-3 { gap: var(--space-md); }
.gap-4 { gap: var(--space-lg); }

.hidden { display: none; }
.visible { display: block; }

/* ==========================================================================
   7. Accessibility
   ========================================================================== */

a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary-navy);
    color: var(--color-text-light);
    padding: var(--space-sm) var(--space-md);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

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

@media (prefers-contrast: high) {
    :root {
        --color-text-primary: #000000;
        --color-text-secondary: #333333;
        --color-bg-light: #ffffff;
        --color-bg-white: #ffffff;
    }

    .btn,
    .admin-button,
    .logout-button {
        border: 2px solid currentColor;
    }
}