/**
 * Vasundhara Kalakshetra — Design System
 * ---------------------------------------------------------------
 * Classical Maroon & Gold palette with modern glassmorphism.
 * Fonts: Inter (body), Outfit (headings)
 * ---------------------------------------------------------------
 */

/* ================================================================
   CSS Custom Properties (Design Tokens)
   ================================================================ */
:root {
    /* ---- Brand Palette ---- */
    --vk-maroon:         #6B1D2A;
    --vk-maroon-dark:    #4A1019;
    --vk-maroon-light:   #8B3A4A;
    --vk-gold:           #C9A84C;
    --vk-gold-light:     #E8D48B;
    --vk-gold-dark:      #A6872F;
    --vk-cream:          #FDF6EC;
    --vk-cream-dark:     #F5E6CE;

    /* ---- Neutrals ---- */
    --vk-gray-50:        #FAFAFA;
    --vk-gray-100:       #F4F4F5;
    --vk-gray-200:       #E4E4E7;
    --vk-gray-300:       #D4D4D8;
    --vk-gray-500:       #71717A;
    --vk-gray-700:       #3F3F46;
    --vk-gray-900:       #18181B;

    /* ---- Semantic ---- */
    --vk-success:        #16A34A;
    --vk-error:          #DC2626;
    --vk-warning:        #F59E0B;

    /* ---- Typography ---- */
    --font-body:         'Inter', system-ui, -apple-system, sans-serif;
    --font-heading:      'Outfit', 'Inter', system-ui, sans-serif;

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

    /* ---- Radii ---- */
    --radius-sm:  0.375rem;
    --radius-md:  0.625rem;
    --radius-lg:  1rem;
    --radius-xl:  1.5rem;
    --radius-full: 9999px;

    /* ---- Shadows ---- */
    --shadow-sm:   0 1px 2px rgba(0,0,0,0.06);
    --shadow-md:   0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg:   0 8px 30px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 20px rgba(201,168,76,0.25);

    /* ---- Transitions ---- */
    --transition-fast:  150ms ease;
    --transition-base:  250ms ease;
    --transition-slow:  400ms ease;
}


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

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

body {
    font-family: var(--font-body);
    color: var(--vk-gray-900);
    background-color: var(--vk-cream);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--vk-maroon);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--vk-gold-dark);
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.25;
    color: var(--vk-gray-900);
}


/* ================================================================
   Container
   ================================================================ */
.vk-container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-lg);
}


/* ================================================================
   Header / Navigation
   ================================================================ */
.vk-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(253, 246, 236, 0.85);
    backdrop-filter: blur(12px) saturate(150%);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    border-bottom: 1px solid var(--vk-cream-dark);
    transition: box-shadow var(--transition-base);
}
.vk-header--scrolled {
    box-shadow: var(--shadow-md);
}

.vk-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.vk-header__brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--vk-maroon);
}
.vk-header__brand:hover {
    color: var(--vk-maroon);
}

.vk-header__logo-icon {
    font-size: 1.6rem;
}
.vk-header__logo-accent {
    color: var(--vk-gold-dark);
}

.vk-header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.vk-nav-link {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--vk-gray-700);
    transition: all var(--transition-fast);
}
.vk-nav-link:hover {
    color: var(--vk-maroon);
    background: rgba(107, 29, 42, 0.06);
}

.vk-nav-link--primary {
    background: var(--vk-maroon);
    color: #fff !important;
}
.vk-nav-link--primary:hover {
    background: var(--vk-maroon-dark);
    color: #fff !important;
}

.vk-nav-link--ghost {
    color: var(--vk-gray-500);
}

/* Hamburger */
.vk-header__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}
.vk-header__hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--vk-maroon);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .vk-header__hamburger { display: flex; }
    .vk-header__nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: var(--space-md);
        background: rgba(253, 246, 236, 0.97);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--vk-cream-dark);
        box-shadow: var(--shadow-md);
    }
    .vk-header__nav.is-open { display: flex; }
    .vk-nav-link { width: 100%; text-align: center; }
}


/* ================================================================
   Hero Section
   ================================================================ */
.vk-hero {
    padding: var(--space-3xl) 0;
    text-align: center;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(107,29,42,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(201,168,76,0.1) 0%, transparent 50%),
        var(--vk-cream);
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.vk-hero__title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.vk-text-gradient {
    background: linear-gradient(135deg, var(--vk-maroon), var(--vk-gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.vk-hero__subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--vk-gray-500);
    max-width: 600px;
    margin-inline: auto;
    margin-bottom: var(--space-xl);
}

.vk-hero__actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}


/* ================================================================
   Buttons
   ================================================================ */
.vk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1;
}

.vk-btn--primary {
    background: linear-gradient(135deg, var(--vk-maroon), var(--vk-maroon-dark));
    color: #fff;
    border-color: var(--vk-maroon);
    box-shadow: 0 2px 8px rgba(107,29,42,0.3);
}
.vk-btn--primary:hover {
    background: linear-gradient(135deg, var(--vk-maroon-light), var(--vk-maroon));
    box-shadow: 0 4px 16px rgba(107,29,42,0.4);
    transform: translateY(-1px);
    color: #fff;
}

.vk-btn--outline {
    background: transparent;
    color: var(--vk-maroon);
    border-color: var(--vk-maroon);
}
.vk-btn--outline:hover {
    background: var(--vk-maroon);
    color: #fff;
}

.vk-btn--full {
    width: 100%;
}


/* ================================================================
   Forms
   ================================================================ */
.vk-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.vk-form__group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.vk-form__label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--vk-gray-700);
}

.vk-form__optional {
    font-weight: 400;
    color: var(--vk-gray-500);
    font-size: 0.8rem;
}

.vk-form__input {
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--vk-gray-200);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--vk-gray-900);
    background: #fff;
    transition: all var(--transition-fast);
    outline: none;
}
.vk-form__input::placeholder {
    color: var(--vk-gray-300);
}
.vk-form__input:focus {
    border-color: var(--vk-maroon);
    box-shadow: 0 0 0 3px rgba(107,29,42,0.12);
}

.vk-form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}
@media (max-width: 480px) {
    .vk-form__row {
        grid-template-columns: 1fr;
    }
}


/* ================================================================
   Auth Pages
   ================================================================ */
.vk-auth {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl) var(--space-lg);
    background:
        radial-gradient(ellipse at 50% 0%, rgba(201,168,76,0.08) 0%, transparent 50%),
        var(--vk-cream);
}

.vk-auth__card {
    width: 100%;
    max-width: 460px;
    background: rgba(255,255,255,0.75);
    backdrop-filter: blur(16px) saturate(120%);
    -webkit-backdrop-filter: blur(16px) saturate(120%);
    border: 1px solid rgba(255,255,255,0.6);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-lg);
}

.vk-auth__title {
    font-size: 1.75rem;
    text-align: center;
    color: var(--vk-maroon);
    margin-bottom: var(--space-xs);
}

.vk-auth__subtitle {
    text-align: center;
    color: var(--vk-gray-500);
    font-size: 0.9rem;
    margin-bottom: var(--space-xl);
}

.vk-auth__footer {
    text-align: center;
    margin-top: var(--space-lg);
    font-size: 0.9rem;
    color: var(--vk-gray-500);
}
.vk-auth__footer a {
    font-weight: 600;
    color: var(--vk-maroon);
}


/* ================================================================
   Alerts / Flash Messages
   ================================================================ */
.vk-alert {
    padding: var(--space-md) var(--space-lg);
    font-size: 0.9rem;
    font-weight: 500;
    border-bottom: 2px solid;
    animation: vk-slideDown 0.35s ease;
}
.vk-alert--success {
    background: #F0FDF4;
    color: var(--vk-success);
    border-color: var(--vk-success);
}
.vk-alert--error {
    background: #FEF2F2;
    color: var(--vk-error);
    border-color: var(--vk-error);
}

@keyframes vk-slideDown {
    from { transform: translateY(-100%); opacity: 0; }
    to   { transform: translateY(0);     opacity: 1; }
}


/* ================================================================
   Dashboard
   ================================================================ */
.vk-dashboard {
    padding: var(--space-2xl) 0;
    flex: 1;
}

.vk-dashboard__header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}
.vk-dashboard__header h1 {
    font-size: 1.75rem;
}

.vk-badge {
    display: inline-flex;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.vk-badge--admin   { background: var(--vk-maroon); color: #fff; }
.vk-badge--guru    { background: var(--vk-gold);   color: var(--vk-maroon-dark); }
.vk-badge--student { background: var(--vk-gray-200); color: var(--vk-gray-700); }

.vk-dashboard__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--space-lg);
}


/* ================================================================
   Cards
   ================================================================ */
.vk-card {
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.5);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.vk-card--interactive {
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}
.vk-card--interactive:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--vk-gold-light);
    color: inherit;
}

.vk-card__icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.vk-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.vk-card p {
    font-size: 0.9rem;
    color: var(--vk-gray-500);
}


/* ================================================================
   Offline Page
   ================================================================ */
.vk-offline {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) var(--space-lg);
}

.vk-offline__icon {
    font-size: 4rem;
    margin-bottom: var(--space-lg);
    animation: vk-pulse 2s ease-in-out infinite;
}

@keyframes vk-pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50%      { transform: scale(1.1); opacity: 0.7; }
}

.vk-text-center { text-align: center; }


/* ================================================================
   Footer
   ================================================================ */
.vk-footer {
    padding: var(--space-lg) 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--vk-gray-500);
    border-top: 1px solid var(--vk-cream-dark);
    margin-top: auto;
}


/* ================================================================
   Main Content Area
   ================================================================ */
.vk-main {
    flex: 1;
    display: flex;
    flex-direction: column;
}