/* Modern CSS - Light & Dark Mode Support */

:root {
    --primary: #6366f1;
    --primary-dark: #764ba2;
    --success: #10b981;
    --success-dark: #059669;
    --danger: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    /* Light Mode (default) */
    --text: #1e293b;
    --text-light: #64748b;
    --text-light-2: #94a3b8;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border: #e2e8f0;
    --form-bg: #ffffff;
    --form-text: #1e293b;
    --form-border: #cbd5e1;
    --label-color: #1e293b;
    --overlay-bg: rgba(241, 245, 249, 0.9);
}

/* Dark Mode */
:root[data-theme="dark"] {
    --text: #f1f5f9;
    --text-light: #cbd5e1;
    --text-light-2: #94a3b8;
    --bg-light: #0f172a;
    --bg-white: #1e293b;
    --border: #334155;
    --form-bg: #0f172a;
    --form-text: #f1f5f9;
    --form-border: #475569;
    --label-color: #f1f5f9;
    --overlay-bg: rgba(15, 23, 42, 0.3);
}


/* ========== GLOBAL STYLES ========== */

body {
    position: relative;
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-light);
    z-index: -1;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-bg);
    pointer-events: none;
    z-index: -1;
}

.site-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 300px;
    padding: 2rem 1rem;
    position: relative;
    z-index: 1;
}

.header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1000px;
    gap: 2rem;
    margin-bottom: 2rem;
}

.logo {
    max-width: 100px;
    max-height: 100px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.header span {
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--text);
    letter-spacing: -0.5px;
}

.header .flex-grow-1 {
    flex-grow: 1;
    text-align: center;
}

.header-right {
    font-weight: 600;
    font-size: 0.95rem;
    min-width: 160px;
    text-align: right;
    color: var(--text);
}

.header-right .course-code {
    line-height: 1.2;
    font-size: 0.85rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.header-right .course-code-login {
    font-size: 1rem;
    color: var(--text);
    opacity: 0.9;
}

.logout-btn {
    font-weight: 600;
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    color: #ffffff;
}

.logout-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
}

/* ========== FORM CONTROLS ========== */

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--label-color);
    font-size: 0.95rem;
}

.form-control {
    display: block;
    width: 100%;
    height: auto;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    color: var(--form-text);
    background-color: var(--form-bg);
    border: 1px solid var(--form-border);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.form-control::placeholder {
    color: var(--text-light-2);
}

.form-control:focus {
    background-color: var(--bg-white);
    border-color: var(--primary);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.input-group {
    display: flex;
    gap: 0;
}

.input-group > .form-control {
    border-radius: 0.5rem 0 0 0.5rem;
    flex: 1;
}

.input-group-append {
    display: flex;
}

.input-group-append .btn {
    border-radius: 0 0.5rem 0.5rem 0;
    border-left: 1px solid var(--form-border);
    background-color: var(--form-bg);
    color: var(--text-light-2);
    border: 1px solid var(--form-border);
    border-left: none;
    padding: 0 0.75rem;
    font-size: 0.85rem;
    white-space: nowrap;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-outline-light {
    color: var(--primary);
    border-color: var(--form-border);
    background-color: var(--form-bg);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-outline-light:hover {
    color: var(--primary);
    background-color: var(--bg-white);
    border-color: var(--primary);
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.form-check-input {
    width: 1.1rem;
    height: 1.1rem;
    cursor: pointer;
    accent-color: var(--primary);
    border: 1px solid var(--form-border);
    border-radius: 1rem;
    background-color: var(--form-bg);
}

.form-check-label {
    margin-bottom: 0;
    cursor: pointer;
    color: var(--text-light);
    font-weight: 500;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--form-bg);
    border: 1px solid var(--form-border);
    border-radius: 0.5rem;
}

/* ========== BUTTONS ========== */

.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
}

.browse-btn {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.browse-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--success-dark) 0%, #047857 100%);
}

.search-button {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    font-weight: 600;
    padding: 0.875rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    box-shadow: var(--shadow-md);
}

.search-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

.search-button:active:not(:disabled) {
    transform: translateY(0);
}

.search-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#login-button {
    display: block;
    width: 100%;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

#login-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

#login-button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

/* ========== CONTAINERS ========== */

.index-container,
.login-container {
    background: var(--bg-white);
    color: var(--text);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border-radius: 1rem;
    backdrop-filter: blur(10px);
}

.index-container {
    padding: 2rem;
    max-width: 900px;
}

.login-container {
    padding: 2.5rem;
    max-width: 480px;
}

.form-title,
.login-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
}

.form-title {
    font-size: 2rem;
}

#search-form,
#login-form {
    border: none;
    padding: 0;
}

/* ========== DROP AREA ========== */

#drop-area {
    border: 2px dashed var(--primary);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    width: 100%;
    height: 250px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--form-bg) 0%, var(--bg-white) 100%);
    cursor: pointer;
    transition: all 0.3s ease;
}

#drop-area:hover {
    border-color: var(--primary-dark);
    background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

#drop-area.drag-over {
    border-color: var(--primary);
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--border) 100%);
    transform: scale(1.02);
}

#drop-zone {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

#drop-zone h3 {
    margin: 0;
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 700;
}

#preview-container {
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: rgba(248, 250, 252, 0.98);
    border-radius: 1rem;
}

.preview {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 0.5rem;
}

#remove-image {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    border: none;
    color: white;
    border-radius: 50%;
    width: 2rem;
    height: 2rem;
    padding: 0;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

#remove-image:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* ========== ALERTS & MESSAGES ========== */

#login-alert {
    background: rgba(127, 29, 29, 0.3);
    color: #fca5a5;
    border: 1px solid #7f1d1d;
    border-radius: 0.75rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
}

.predicted-content {
    background: var(--bg-light);
    color: var(--text);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    max-width: 800px;
}

.predicted-content p {
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text);
}

.predicted-content p:last-child {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.predicted-content .text-primary {
    color: var(--primary);
}

.predicted-content .text-success {
    color: var(--success);
}

/* ========== RESULTS & LOADING ========== */

#loading-spinner {
    text-align: center;
    margin-top: 1rem;
    display: flex;
    justify-content: center;
}

.spinner-border {
    color: var(--primary);
    border-color: rgba(99, 102, 241, 0.15);
    border-right-color: var(--primary);
}

.result-container {
    margin-top: 2rem;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

#predicted-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 1.5rem;
}

.result-img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.result-img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

#rp-curve {
    margin-top: 1.5rem;
    max-width: 100%;
    height: auto;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    grid-column: 1 / -1;
}

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

#imageModal .modal-dialog {
    max-width: 90vw;
    justify-content: center;
}

#imageModal .modal-content {
    width: fit-content;
    height: fit-content;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    align-self: center;
    background: transparent;
    border-radius: 0.75rem;
}

#imageModal .modal-body {
    text-align: center;
    padding: 0;
}

#modalImage {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
}

/* ========== UTILITY ========== */

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

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-0 { margin-bottom: 0; }

.d-none {
    display: none !important;
}

.d-flex {
    display: flex;
}

.m-2 {
    margin: 0.5rem;
}

.p-3 {
    padding: 0.75rem;
}

.p-4 {
    padding: 1rem;
}

.rounded {
    border-radius: 0.5rem;
}

.shadow {
    box-shadow: var(--shadow-md);
}

/* ========== SELECT2 STYLING ========== */

.select2-container--default.select2-container--open .select2-selection--multiple,
.select2-container--default.select2-container--focus .select2-selection--multiple {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.select2-container--default .select2-selection--multiple {
    background-color: var(--form-bg);
    border: 1px solid var(--form-border);
    border-radius: 0.5rem;
    height: auto;
    
}

.select2-container--default .select2-selection--multiple .select2-selection__rendered {

    color: var(--form-text);
}

.select2-container--default .select2-selection--multiple .select2-selection__choice {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
    padding: 0 0.5rem;
    border-radius: 0.25rem;
    margin-right: 0.25rem;
    margin-top: 0.25rem;
}

.select2-container--default .select2-selection--multiple .select2-selection__choice__remove {
    color: white;
    margin-right: 0.25rem;
    cursor: pointer;
}

.select2-container--default .select2-selection--multiple .select2-selection__choice__remove:hover {
    opacity: 0.8;
}

.select2-dropdown {
    background-color: var(--form-bg);
    border: 1px solid var(--form-border);
    border-radius: 0.5rem;
}

.select2-container--default .select2-dropdown .select2-search--inline .select2-search__field {
    background: transparent;
    color: var(--form-text);
    border: none;
}

.select2-results__option {
    color: var(--form-text);
    padding: 0.5rem 1rem;
    background-color: var(--form-bg);
}

.select2-results__option--highlighted[aria-selected] {
    background-color: var(--primary);
    color: white;
}

.select2-results__option[aria-selected="true"] {
    background-color: rgba(99, 102, 241, 0.15);
}

/* Responsive */
@media (max-width: 1200px) {
    .result-container {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
        margin-bottom: 1.5rem;
    }

    .header span {
        font-size: 1.5rem;
    }

    .index-container,
    .login-container {
        padding: 1.5rem;
        max-width: 95%;
    }

    .form-title,
    .login-title {
        font-size: 1.5rem;
    }

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

@media (max-width: 480px) {
    .result-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .result-img {
        height: 100px;
    }
}