/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Primary Colors */
    --primary-50: hsl(220, 100%, 97%);
    --primary-100: hsl(220, 95%, 92%);
    --primary-200: hsl(220, 90%, 85%);
    --primary-300: hsl(220, 85%, 75%);
    --primary-400: hsl(220, 80%, 65%);
    --primary-500: hsl(220, 75%, 55%);
    --primary-600: hsl(220, 70%, 45%);
    --primary-700: hsl(220, 65%, 35%);
    --primary-800: hsl(220, 60%, 25%);
    --primary-900: hsl(220, 55%, 15%);

    /* Accent Colors */
    --accent-purple: hsl(270, 70%, 60%);
    --accent-pink: hsl(330, 75%, 65%);
    --accent-cyan: hsl(190, 75%, 55%);
    --accent-green: hsl(150, 65%, 50%);
    --accent-orange: hsl(25, 85%, 60%);

    /* Neutral Colors */
    --neutral-50: hsl(220, 20%, 98%);
    --neutral-100: hsl(220, 15%, 95%);
    --neutral-200: hsl(220, 12%, 88%);
    --neutral-300: hsl(220, 10%, 75%);
    --neutral-400: hsl(220, 8%, 60%);
    --neutral-500: hsl(220, 6%, 45%);
    --neutral-600: hsl(220, 8%, 30%);
    --neutral-700: hsl(220, 10%, 20%);
    --neutral-800: hsl(220, 12%, 12%);
    --neutral-900: hsl(220, 15%, 8%);

    /* Semantic Colors */
    --success: hsl(150, 65%, 50%);
    --warning: hsl(40, 90%, 55%);
    --warning-50: hsl(40, 90%, 95%);
    --error: hsl(0, 75%, 60%);
    --info: hsl(200, 75%, 55%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-500) 0%, var(--accent-purple) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 50%, var(--accent-pink) 100%);
    --gradient-dark: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-900) 100%);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Global Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--neutral-800);
    background: var(--gradient-dark);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Login Page Styles ===== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    position: relative;
    overflow: hidden;
}

.background-decoration {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-purple) 0%, transparent 70%);
    opacity: 0.15;
    animation: float 20s infinite ease-in-out;
}

.circle-1 {
    width: 500px;
    height: 500px;
    top: -250px;
    left: -250px;
    animation-delay: 0s;
}

.circle-2 {
    width: 400px;
    height: 400px;
    bottom: -200px;
    right: -200px;
    background: radial-gradient(circle, var(--accent-cyan) 0%, transparent 70%);
    animation-delay: -7s;
}

.circle-3 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--accent-pink) 0%, transparent 70%);
    animation-delay: -14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -30px) scale(1.1);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-10);
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 1;
    border: 1px solid rgba(255, 255, 255, 0.3);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.logo-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-glow);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow: var(--shadow-glow);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
    }
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: white;
}

.login-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: var(--space-2);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: var(--font-size-base);
    color: var(--neutral-500);
    font-weight: 400;
}

/* ===== Form Styles ===== */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--neutral-700);
}

.user-type-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
}

.user-type-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4);
    background: var(--neutral-50);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--neutral-600);
}

.user-type-btn svg {
    width: 28px;
    height: 28px;
    transition: all var(--transition-base);
}

.user-type-btn:hover {
    background: var(--neutral-100);
    border-color: var(--primary-300);
    transform: translateY(-2px);
}

.user-type-btn.active {
    background: var(--gradient-primary);
    border-color: var(--primary-500);
    color: white;
    box-shadow: var(--shadow-glow);
}

.user-type-btn.active svg {
    color: white;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--space-4);
    width: 20px;
    height: 20px;
    color: var(--neutral-400);
    pointer-events: none;
    transition: color var(--transition-base);
}

.input-wrapper input {
    width: 100%;
    padding: var(--space-4) var(--space-4) var(--space-4) var(--space-12);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--neutral-800);
    background: var(--neutral-50);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    outline: none;
}

.input-wrapper input:focus {
    background: white;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.input-wrapper input:focus+.input-icon,
.input-wrapper:focus-within .input-icon {
    color: var(--primary-500);
}

.toggle-password {
    position: absolute;
    right: var(--space-4);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.toggle-password:hover {
    transform: scale(1.1);
}

.eye-icon {
    width: 20px;
    height: 20px;
    color: var(--neutral-400);
    transition: color var(--transition-base);
}

.toggle-password:hover .eye-icon {
    color: var(--primary-500);
}

.remember-forgot {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--neutral-600);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-500);
}

.forgot-password {
    font-size: var(--font-size-sm);
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-base);
}

.forgot-password:hover {
    color: var(--primary-700);
    text-decoration: underline;
}

.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: white;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

.error-message {
    padding: var(--space-4);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    color: var(--error);
    font-size: var(--font-size-sm);
    display: none;
    animation: shake 0.4s;
}

.error-message.show {
    display: block;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

.login-footer {
    margin-top: var(--space-8);
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--neutral-400);
}

/* ===== Dashboard Common Styles ===== */
.dashboard-container {
    min-height: 100vh;
    background: var(--neutral-100);
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    background: white;
    border-right: 1px solid var(--neutral-200);
    padding: var(--space-6);
    overflow-y: auto;
    z-index: 100;
    transition: transform var(--transition-base);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--neutral-200);
}

.sidebar-logo {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.sidebar-logo svg {
    width: 24px;
    height: 24px;
}

.sidebar-title h2 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--neutral-900);
}

.sidebar-title p {
    font-size: var(--font-size-xs);
    color: var(--neutral-500);
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: var(--space-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--neutral-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    font-weight: 500;
}

.nav-link svg {
    width: 20px;
    height: 20px;
}

.nav-link:hover {
    background: var(--neutral-100);
    color: var(--primary-600);
}

.nav-link.active {
    background: var(--gradient-primary);
    color: white;
}

.main-content {
    margin-left: 280px;
    padding: var(--space-6);
}

.top-bar {
    background: white;
    padding: var(--space-5) var(--space-6);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.page-title h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--neutral-900);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding-left: var(--space-4);
    border-left: 1px solid var(--neutral-200);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.btn-logout {
    padding: var(--space-3) var(--space-5);
    background: var(--neutral-100);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-md);
    color: var(--neutral-700);
    font-family: var(--font-family);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-logout:hover {
    background: var(--error);
    color: white;
    border-color: var(--error);
}

.btn-secondary {
    padding: var(--space-3) var(--space-5);
    background: var(--neutral-100);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-md);
    color: var(--neutral-700);
    font-family: var(--font-family);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: var(--neutral-200);
    color: var(--neutral-900);
    border-color: var(--neutral-300);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}

.card {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .user-type-selector {
        grid-template-columns: 1fr;
    }

    .login-card {
        padding: var(--space-6);
    }
}

/* ===== College Identity Styles ===== */
.college-header {
    position: absolute;
    top: 2rem;
    left: 0;
    right: 0;
    text-align: center;
    z-index: 10;
    pointer-events: none;
}

.college-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
    animation: fadeInDown 0.8s ease-out;
}

.college-banner {
    background: var(--gradient-primary);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-md);
    text-align: center;
    animation: fadeInDown 0.5s ease-out;
}

.college-banner h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: white;
    margin: 0;
    letter-spacing: 0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Lab Management Styling ===== */
.lab-section-card {
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-200);
    padding: var(--space-5);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.lab-section-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
}

.lab-section-card.chemical::before {
    background: var(--primary-500);
}

.lab-section-card.glassware::before {
    background: var(--accent-purple);
}

.lab-section-card.equipment::before {
    background: var(--accent-orange);
}

.lab-section-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.lab-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    gap: var(--space-4);
}

.lab-section-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: 0;
}

.lab-item-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.lab-item-table th {
    background: var(--neutral-50);
    color: var(--neutral-500);
    font-weight: 600;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-3);
    border-bottom: 2px solid var(--neutral-100);
    text-align: left;
}

.lab-item-table td {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--neutral-50);
    transition: var(--transition-fast);
}

.lab-item-table tr:hover td {
    background: var(--neutral-50);
}

.lab-item-table .form-control {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.lab-item-table .form-control:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
    outline: none;
}

.btn-add-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-add-item.chemical {
    background: var(--primary-50);
    color: var(--primary-700);
}

.btn-add-item.glassware {
    background: hsl(270, 70%, 97%);
    color: var(--accent-purple);
}

.btn-add-item.equipment {
    background: hsl(25, 85%, 97%);
    color: var(--accent-orange);
}

.btn-add-item:hover {
    transform: scale(1.05);
    filter: contrast(1.1);
}

.btn-add-item:active {
    transform: scale(0.95);
}

.btn-remove-row {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    border: none;
    background: var(--neutral-100);
    color: var(--neutral-500);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1.2rem;
    line-height: 1;
}

.btn-remove-row:hover {
    background: var(--error);
    color: white;
    transform: rotate(90deg);
}

@media (max-width: 768px) {
    .college-header h1 {
        font-size: 1.5rem;
        padding: 0 1rem;
    }

    .college-banner h1 {
        font-size: 1.25rem;
    }
}