/* =============================================================================
   AIM-IQAC Website Styles
   Internal Quality Assurance Cell - Assam Institute of Management

   Mobile-first responsive CSS with institutional branding
   NAAC-compliant: Accessible contrast, clean professional layout
   ============================================================================= */

/* =============================================================================
   Google Fonts Import
   ============================================================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:wght@600;700&display=swap');

/* =============================================================================
   CSS Reset & Custom Properties
   ============================================================================= */

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

:root {
    /* Color Palette - Professional Institutional Branding */
    --color-primary: #0f2a4a;           /* Deep navy blue */
    --color-primary-light: #1a3d5c;     /* Lighter navy */
    --color-primary-dark: #0a1f38;      /* Darker navy */
    --color-secondary: #8b1538;         /* Rich burgundy/maroon */
    --color-secondary-light: #a91d45;   /* Lighter maroon */
    --color-accent: #c9a227;            /* Gold accent */
    --color-accent-light: #ddb832;      /* Lighter gold */
    --color-background: #ffffff;        /* White background */
    --color-surface: #f8f9fa;           /* Light surface */
    --color-surface-alt: #eef2f6;       /* Alternative surface */
    --color-text: #2c3e50;              /* Dark text */
    --color-text-light: #5a6c7d;        /* Secondary text */
    --color-text-muted: #8895a4;        /* Muted text */
    --color-border: #e1e5eb;            /* Light border */
    --color-border-dark: #c8ced6;       /* Darker border */
    --color-success: #28a745;           /* Success green */
    --color-link-hover: #0d4a7a;        /* Link hover */

    /* Typography */
    --font-heading: "Playfair Display", Georgia, serif;
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-size-base: 16px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-base: 1.7;
    --line-height-heading: 1.3;
    --letter-spacing-tight: -0.02em;
    --letter-spacing-wide: 0.05em;

    /* Layout */
    --max-width: 1200px;
    --content-width: 900px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Effects */
    --shadow-sm: 0 1px 3px rgba(15, 42, 74, 0.08);
    --shadow-md: 0 4px 12px rgba(15, 42, 74, 0.1);
    --shadow-lg: 0 8px 30px rgba(15, 42, 74, 0.12);
    --shadow-xl: 0 20px 40px rgba(15, 42, 74, 0.15);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;

    /* Header */
    --header-height: 70px;
}

/* =============================================================================
   Base Typography
   ============================================================================= */

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-surface);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-heading);
    color: var(--color-primary);
    letter-spacing: var(--letter-spacing-tight);
}

h1 {
    font-size: 1.875rem;
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

h2::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    border-radius: 2px;
}

h3 {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

p:last-child {
    margin-bottom: 0;
}

strong {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
}

/* =============================================================================
   Links
   ============================================================================= */

a {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
}

a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

a:focus:not(:focus-visible) {
    outline: none;
}

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* =============================================================================
   Lists
   ============================================================================= */

ul, ol {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-xs);
}

li:last-child {
    margin-bottom: 0;
}

li::marker {
    color: var(--color-secondary);
}

/* =============================================================================
   Header & Navigation
   ============================================================================= */

header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-background);
    min-height: var(--header-height);
    box-shadow: var(--shadow-lg);
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
}

.branding {
    flex-shrink: 0;
}

.institution-name {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-background);
    letter-spacing: 0.01em;
}

/* Navigation */
nav {
    width: 100%;
    order: 3;
}

.menu-toggle {
    display: block;
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.menu-toggle:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.menu-icon {
    display: block;
    position: relative;
    width: 22px;
    height: 2px;
    background-color: var(--color-background);
    margin: 0 auto;
    transition: background var(--transition-fast);
}

.menu-icon::before,
.menu-icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 22px;
    height: 2px;
    background-color: var(--color-background);
    transition: transform var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.menu-icon::before {
    top: -7px;
}

.menu-icon::after {
    bottom: -7px;
}

/* Navigation List - Mobile (hidden by default) */
.nav-list {
    display: none;
    list-style: none;
    padding: var(--spacing-sm) 0;
    margin: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-sm);
}

/* Navigation open state */
.nav-open .nav-list {
    display: flex;
}

.nav-open .menu-icon {
    background-color: transparent;
}

.nav-open .menu-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-open .menu-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}

.nav-list li {
    margin: 0;
    padding: 0;
}

.nav-list a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-background);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: 0.9375rem;
    letter-spacing: 0.02em;
    border-bottom: none;
    transition: background var(--transition-fast);
}

.nav-list a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-background);
}

.nav-list a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
}

.nav-list a[aria-current="page"] {
    background: var(--color-secondary);
    font-weight: var(--font-weight-semibold);
    position: relative;
}

/* =============================================================================
   Main Content
   ============================================================================= */

main {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    width: 100%;
}

/* Content Cards */
section {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

section:last-child {
    margin-bottom: 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
    border: none;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.hero h1 {
    color: var(--color-background);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
    position: relative;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero .subtitle {
    font-size: 1rem;
    color: var(--color-accent);
    font-weight: var(--font-weight-semibold);
    margin-bottom: 0;
    position: relative;
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

/* Page Header (for inner pages) */
.page-header {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border: none;
    box-shadow: var(--shadow-lg);
}

.page-header h1 {
    color: var(--color-background);
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.page-header p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Content Section Styles */
.about,
.vision,
.mission,
.objectives,
.functions,
.committee-intro,
.committee-composition,
.coordinator,
.contact-iqac {
    position: relative;
}

.vision,
.mission {
    background: linear-gradient(135deg, var(--color-surface-alt) 0%, var(--color-surface) 100%);
    border-left: 4px solid var(--color-secondary);
}

/* =============================================================================
   Tables
   ============================================================================= */

.table-responsive {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 500px;
    background: var(--color-background);
}

thead {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-background);
}

th {
    padding: var(--spacing-md) var(--spacing-sm);
    text-align: left;
    font-family: var(--font-body);
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    white-space: nowrap;
}

td {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
    font-size: 0.9375rem;
}

/* Zebra striping */
tbody tr:nth-child(even) {
    background-color: var(--color-surface);
}

tbody tr {
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background-color: var(--color-surface-alt);
}

tbody tr:last-child td {
    border-bottom: none;
}

.disclaimer {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
    font-style: italic;
}

/* =============================================================================
   Document Lists (PDF Links)
   ============================================================================= */

.documents-section {
    margin-bottom: var(--spacing-lg);
}

.document-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0 0 0;
    display: grid;
    gap: var(--spacing-sm);
}

.document-list li {
    margin: 0;
    padding: 0;
}

.document-list a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-secondary);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: all var(--transition-base);
}

.document-list a::before {
    content: "";
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
    border-radius: var(--radius-sm);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6zm-1 2l5 5h-5V4zM6 20V4h5v7h7v9H6z'/%3E%3Ctext x='6' y='18' font-size='5' font-weight='bold' fill='white'%3EPDF%3C/text%3E%3C/svg%3E");
    background-size: 20px;
    background-position: center;
    background-repeat: no-repeat;
}

.document-list a:hover {
    background: var(--color-background);
    border-color: var(--color-secondary);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.document-list a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* =============================================================================
   Coordinator & Contact Sections
   ============================================================================= */

.coordinator,
.contact-iqac {
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-alt) 100%);
    border-left: 4px solid var(--color-accent);
}

.coordinator p,
.contact-iqac p {
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
}

.coordinator a,
.contact-iqac a {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.coordinator a:hover,
.contact-iqac a:hover {
    color: var(--color-secondary);
}

/* =============================================================================
   Footer
   ============================================================================= */

footer {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: var(--color-background);
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: auto;
}

footer::before {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
    margin: 0 auto var(--spacing-lg);
    border-radius: 2px;
}

footer p {
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.85);
}

footer p:first-of-type {
    font-weight: var(--font-weight-semibold);
    font-size: 1rem;
    color: var(--color-background);
}

footer p:last-child {
    margin-bottom: 0;
    color: var(--color-accent);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    font-size: 0.75rem;
}

/* =============================================================================
   Utility Classes
   ============================================================================= */

.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;
}

/* Skip Navigation Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.skip-link:focus {
    top: 0;
    outline: 2px solid var(--color-background);
    outline-offset: 2px;
}

/* =============================================================================
   Responsive Breakpoints
   ============================================================================= */

/* Tablet and up (768px) */
@media (min-width: 768px) {
    :root {
        --header-height: 80px;
    }

    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .header-content {
        flex-wrap: nowrap;
        padding: var(--spacing-sm) var(--spacing-lg);
    }

    .institution-name {
        font-size: 1.25rem;
    }

    /* Desktop navigation */
    nav {
        width: auto;
        order: 0;
    }

    .menu-toggle {
        display: none;
    }

    .nav-list {
        display: flex;
        flex-direction: row;
        gap: var(--spacing-xs);
        background: transparent;
        padding: 0;
        margin: 0;
    }

    .nav-list a {
        padding: var(--spacing-xs) var(--spacing-md);
        border-radius: var(--radius-sm);
    }

    .nav-list a[aria-current="page"] {
        background: var(--color-secondary);
    }

    .nav-list a:hover {
        background: rgba(255, 255, 255, 0.15);
    }

    main {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    section {
        padding: var(--spacing-xl);
    }

    .hero {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero .subtitle {
        font-size: 1.125rem;
    }

    .page-header {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }

    /* Table adjustments */
    table {
        min-width: auto;
    }

    th, td {
        padding: var(--spacing-md);
    }

    /* Document list grid */
    .document-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large screens (1024px) */
@media (min-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.875rem;
    }

    .institution-name {
        font-size: 1.375rem;
    }

    main {
        padding: var(--spacing-2xl);
    }

    section {
        padding: var(--spacing-xl) var(--spacing-2xl);
    }

    .hero,
    .page-header {
        padding: var(--spacing-2xl);
    }

    .hero h1 {
        font-size: 2.75rem;
    }
}

/* Extra large screens (1280px) */
@media (min-width: 1280px) {
    .hero h1 {
        font-size: 3rem;
    }

    .hero .subtitle {
        font-size: 1.25rem;
    }
}

/* =============================================================================
   Print Styles
   ============================================================================= */

@media print {
    * {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
    }

    header {
        position: static;
        background: #fff !important;
    }

    .menu-toggle {
        display: none;
    }

    .nav-list {
        display: flex;
    }

    .nav-list a {
        color: #000 !important;
    }

    footer {
        background: #fff !important;
    }

    footer::before {
        display: none;
    }

    a {
        text-decoration: underline;
    }

    .hero,
    .page-header {
        background: #f5f5f5 !important;
        border: 1px solid #ddd;
    }

    .hero h1,
    .page-header h1 {
        color: #000 !important;
    }

    section {
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }
}