/* ============================================
   USER PROFILE
   ============================================ */

.profile-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.profile-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.profile-card {
    background: var(--md-surface);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 2px 8px var(--md-shadow);
}

.profile-image-container {
    width: 150px;
    height: 150px;
    margin: 0 auto 20px;
    position: relative;
}

.profile-img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--md-primary);
}

.profile-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--md-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--md-outline);
}

.profile-placeholder .material-icons {
    font-size: 80px;
    color: var(--md-outline);
}

.profile-card h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--md-on-surface);
}

.profile-card .enrollment {
    font-size: 14px;
    color: var(--md-primary);
    font-weight: 500;
    margin-bottom: 4px;
}

.profile-card .email {
    font-size: 13px;
    color: var(--md-on-surface-variant);
}

.stats-card {
    background: var(--md-surface);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 2px 8px var(--md-shadow);
}

.stats-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--md-on-surface);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--md-surface-variant);
    border-radius: 12px;
    margin-bottom: 12px;
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-item .material-icons {
    font-size: 32px;
    color: var(--md-primary);
}

.stat-item div {
    display: flex;
    flex-direction: column;
}

.stat-item strong {
    font-size: 24px;
    font-weight: 700;
    color: var(--md-on-surface);
}

.stat-item span {
    font-size: 13px;
    color: var(--md-on-surface-variant);
}

.profile-main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.profile-form-card {
    background: var(--md-surface);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 2px 8px var(--md-shadow);
}

.profile-form-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--md-on-surface);
}

textarea.input-field {
    font-family: 'Roboto', sans-serif;
    min-height: 100px;
}

/* User Badge with Image */
.user-badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: var(--md-surface-variant);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--md-on-surface);
    transition: all 0.3s ease;
}

.user-badge:hover {
    background: #E0E0E0;
    transform: translateY(-2px);
}

/* ============================================
   RESPONSIVE - PROFILE
   ============================================ */

@media (max-width: 968px) {
    .profile-container {
        grid-template-columns: 1fr;
    }

    .profile-sidebar {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
}

@media (max-width: 640px) {
    .profile-sidebar {
        grid-template-columns: 1fr;
    }

    .profile-image-container {
        width: 120px;
        height: 120px;
    }
}

/* ============================================
   COMPLETE STYLESHEET
   Save as: style.css
   ============================================ */

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

:root {
    --md-primary: #1976D2;
    --md-primary-dark: #1565C0;
    --md-secondary: #26A69A;
    --md-background: #F0F4F8;
    /* New variable for body background */
    --md-surface: #FFFFFF;
    --md-surface-variant: #F5F5F5;
    --md-on-surface: #1C1B1F;
    --md-on-surface-variant: #49454F;
    --md-outline: #79747E;
    --md-shadow: rgba(0, 0, 0, 0.1);
    --md-error: #B3261E;
    --md-success: #2E7D32;
    --md-input-bg: #FFFFFF;
    --md-border-color: #E0E0E0;
}

[data-theme="dark"] {
    --md-primary: #90CAF9;
    --md-primary-dark: #42A5F5;
    --md-secondary: #80CBC4;
    --md-background: #121212;
    --md-surface: #1E1E1E;
    --md-surface-variant: #2D2D2D;
    --md-on-surface: #E6E1E5;
    --md-on-surface-variant: #CAC4D0;
    --md-outline: #938F99;
    --md-shadow: rgba(0, 0, 0, 0.5);
    --md-error: #F2B8B5;
    --md-success: #81C784;
    --md-input-bg: #2D2D2D;
    --md-border-color: #49454F;
}

body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--md-on-surface);
}

.dashboard-body {
    background: var(--md-background);
}

/* ============================================
   AUTHENTICATION PAGES
   ============================================ */

.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: var(--md-surface);
    border-radius: 28px;
    padding: 40px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 8px 32px var(--md-shadow);
}

.logo-section {
    text-align: center;
    margin-bottom: 32px;
}

.logo-icon {
    font-size: 64px;
    color: var(--md-primary);
    margin-bottom: 16px;
}

.logo-section h1 {
    font-size: 28px;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--md-on-surface);
}

.logo-section p {
    font-size: 14px;
    color: var(--md-on-surface-variant);
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert .material-icons {
    font-size: 20px;
}

.alert-error {
    background: rgba(179, 38, 30, 0.1);
    color: var(--md-error);
    border: 1px solid var(--md-error);
}

.alert-success {
    background: rgba(46, 125, 50, 0.1);
    color: var(--md-success);
    border: 1px solid var(--md-success);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--md-surface-variant);
}

.tab-btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn.active {
    color: var(--md-primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--md-primary);
}

.tab-btn:hover {
    background: rgba(25, 118, 210, 0.05);
}

/* Forms */
.auth-form {
    display: block;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--md-on-surface);
}

.input-field,
input[type="text"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    padding: 16px;
    border: 1px solid var(--md-border-color);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: var(--md-input-bg);
    color: var(--md-on-surface);
    font-family: 'Roboto', sans-serif;
}

.input-field:focus,
input:focus,
select:focus {
    outline: none;
    border-color: var(--md-primary);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.helper-text {
    font-size: 12px;
    color: var(--md-on-surface-variant);
    margin-top: 4px;
    display: block;
}

select {
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 10px 24px;
    border: none;
    border-radius: 20px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    font-size: 14px;
    text-decoration: none;
    font-family: 'Roboto', sans-serif;
}

.btn .material-icons {
    font-size: 18px;
}

.btn-primary {
    background: var(--md-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--md-primary-dark);
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.4);
}

.btn-secondary {
    background: var(--md-surface-variant);
    color: var(--md-on-surface);
}

.btn-secondary:hover {
    background: #E0E0E0;
}

.btn-full {
    width: 100%;
    justify-content: center;
    padding: 14px 24px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    flex: 1;
}

.btn-sm .material-icons {
    font-size: 16px;
}

/* ============================================
   DASHBOARD
   ============================================ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: var(--md-surface);
    box-shadow: 0 2px 8px var(--md-shadow);
    border-radius: 16px;
    padding: 20px 24px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo .material-icons {
    font-size: 32px;
    color: var(--md-primary);
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 500;
    color: var(--md-on-surface);
    margin: 0;
}

.logo-text p {
    font-size: 12px;
    color: var(--md-on-surface-variant);
    margin: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.user-badge {
    padding: 8px 16px;
    background: var(--md-surface-variant);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--md-on-surface);
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
}

/* Filters Sidebar */
.filters-card {
    background: var(--md-surface);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 2px 8px var(--md-shadow);
    height: fit-content;
    position: sticky;
    top: 20px;
}

.filters-card h3 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-group {
    margin-bottom: 20px;
}

.filter-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--md-on-surface-variant);
}

/* Papers Section */
.papers-section {
    background: var(--md-surface);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 2px 8px var(--md-shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-header h2 {
    font-size: 24px;
    font-weight: 500;
}

.search-bar {
    display: flex;
    gap: 12px;
    flex: 1;
    max-width: 400px;
}

.search-bar form {
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--md-outline);
    border-radius: 24px;
    font-size: 14px;
}

/* Papers Grid */
.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.paper-card {
    background: var(--md-surface-variant);
    border-radius: 16px;
    padding: 20px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
}

.paper-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--md-shadow);
    border-color: var(--md-primary);
}

.paper-icon {
    width: 48px;
    height: 48px;
    background: var(--md-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.favorite-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--md-outline);
    padding: 4px;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.favorite-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: scale(1.1);
}

.favorite-btn.active {
    color: #E91E63;
}

.favorite-btn .material-icons {
    font-size: 24px;
}

.paper-icon .material-icons {
    color: white;
    font-size: 28px;
}

.paper-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--md-on-surface);
    line-height: 1.4;
}

.paper-meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 12px;
    color: var(--md-on-surface-variant);
    margin-bottom: 12px;
}

.paper-meta span {
    display: flex;
    gap: 4px;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: var(--md-primary);
    color: white;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    width: fit-content;
}

.no-results {
    text-align: center;
    color: var(--md-on-surface-variant);
    padding: 40px;
    grid-column: 1 / -1;
}

/* ============================================
   DONATION COMPONENTS
   ============================================ */

/* Footer Donation Banner */
.donation-footer {
    background: linear-gradient(135deg, var(--md-primary) 0%, #1565C0 100%);
    color: white;
    padding: 32px;
    border-radius: 16px;
    margin-top: 32px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
    position: relative;
    overflow: hidden;
}

.donation-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(255, 255, 255, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.donation-footer h3 {
    font-size: 22px;
    margin-bottom: 12px;
    font-weight: 500;
    color: white;
}

.donation-footer p {
    margin-bottom: 24px;
    opacity: 0.9;
    font-size: 15px;
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Donation Modal Styling */
.donation-box {
    background: var(--md-surface-variant);
    border: 1px solid transparent;
    border-radius: 16px;
    padding: 24px;
    margin: 24px 0;
    text-align: left;
    transition: all 0.3s ease;
}

.donation-box:hover {
    background: #E3F2FD;
    border-color: var(--md-primary);
}

.donation-method {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    padding: 16px;
    background: var(--md-surface);
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--md-shadow);
    border: 1px solid var(--md-surface-variant);
}

.donation-logo {
    width: 64px;
    height: 64px;
    object-fit: contain;
    background: white;
    border-radius: 12px;
    padding: 8px;
    border: 1px solid #EEEEEE;
}

.donation-details h4 {
    margin: 0 0 4px 0;
    color: var(--md-on-surface);
    font-size: 16px;
    font-weight: 500;
}

.donation-details p {
    margin: 0;
    font-family: 'Roboto Mono', monospace;
    font-size: 18px;
    color: var(--md-primary);
    background: rgba(25, 118, 210, 0.08);
    padding: 6px 12px;
    border-radius: 8px;
    display: inline-block;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.donation-note {
    font-size: 13px;
    color: var(--md-on-surface-variant);
    margin-top: 16px;
    text-align: center;
}

/* Modal specific overrides */
#donationModal .modal-content {
    background: var(--md-surface);
    border-radius: 24px;
}

#donationModal .material-icons.header-icon {
    background: #E3F2FD;
    color: var(--md-primary);
    padding: 20px;
    border-radius: 50%;
    margin-bottom: 16px;
}

/* ============================================
   UPLOAD MODAL
   ============================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--md-surface);
    border-radius: 28px;
    padding: 32px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 24px;
    font-weight: 500;
}

.close-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--md-surface-variant);
}

.upload-zone {
    border: 2px dashed var(--md-outline);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    margin-bottom: 24px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-zone:hover {
    border-color: var(--md-primary);
    background: rgba(25, 118, 210, 0.05);
}

.upload-zone.drag-over {
    border-color: var(--md-primary);
    background: rgba(25, 118, 210, 0.1);
}

.upload-icon {
    font-size: 48px;
    color: var(--md-primary);
    margin-bottom: 16px;
}

.upload-zone h4 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 8px;
}

.upload-zone p {
    color: var(--md-on-surface-variant);
    font-size: 14px;
}

input[type="file"] {
    display: block;
    margin-top: 8px;
}

#selectedFile {
    padding: 12px;
    background: var(--md-surface-variant);
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .filters-card {
        position: relative;
        top: 0;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 12px;
    }

    .auth-card {
        padding: 24px;
    }

    .header {
        padding: 16px;
    }

    .logo-text h1 {
        font-size: 16px;
    }

    .user-info {
        width: 100%;
        justify-content: space-between;
    }

    .papers-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .search-bar {
        max-width: 100%;
    }

    .modal-content {
        padding: 20px;
    }
}

/* ============================================
   UTILITIES
   ============================================ */

.hidden {
    display: none !important;
}