:root {
    --bg-color-main: #f5f7fa;
    --container-bg-color: #ffffff;
    --text-color-main: #334155;
    --text-color-secondary: #64748b;
    --input-border-color: #cbd5e1;
    --input-focus-border-color: #3b82f6;
    --button-bg-color: #3b82f6;
    --button-text-color: #ffffff;
    --button-hover-color: #2563eb;
    --success-color: #16a34a;
    --error-color: #ef4444;
    --header-color: #1e3a8a;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 10px 15px rgba(0, 0, 0, 0.1);
    --border-radius-lg: 12px;
    --border-radius-sm: 8px;
}

body[data-theme="cosmic"] {
    --bg-color-main: #1e293b;
    --container-bg-color: #334155;
    --text-color-main: #f8fafc;
    --text-color-secondary: #94a3b8;
    --input-border-color: #475569;
    --input-focus-border-color: #818cf8;
    --button-bg-color: #818cf8;
    --button-text-color: #1e293b;
    --button-hover-color: #6366f1;
    --success-color: #22c55e;
    --error-color: #f43f5e;
    --header-color: #c7d2fe;
}

body[data-theme="forest"] {
    --bg-color-main: #ecfdf5;
    --container-bg-color: #ffffff;
    --text-color-main: #064e3b;
    --text-color-secondary: #14532d;
    --input-border-color: #6ee7b7;
    --input-focus-border-color: #059669;
    --button-bg-color: #047857;
    --button-text-color: #ffffff;
    --button-hover-color: #065f46;
    --success-color: #16a34a;
    --error-color: #dc2626;
    --header-color: #065f46;
}

body[data-theme="sunrise"] {
    --bg-color-main: #fffbeb;
    --container-bg-color: #ffffff;
    --text-color-main: #713f12;
    --text-color-secondary: #b45309;
    --input-border-color: #fde68a;
    --input-focus-border-color: #f59e0b;
    --button-bg-color: #f59e0b;
    --button-text-color: #713f12;
    --button-hover-color: #d97706;
    --success-color: #fbbf24;
    --error-color: #f43f5e;
    --header-color: #b45309;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color-main);
    color: var(--text-color-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.5s ease;
    padding: 20px;
    box-sizing: border-box;
}

.theme-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    z-index: 1000;
}

.theme-button {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease;
    box-shadow: var(--shadow-light);
}

.theme-button.cosmic { background-color: #334155; }
.theme-button.forest { background-color: #047857; }
.theme-button.sunrise { background-color: #f59e0b; }

.theme-button:hover {
    transform: scale(1.1);
}

.theme-button.active {
    border-color: var(--header-color);
    transform: scale(1.2);
}

.container {
    background-color: var(--container-bg-color);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    width: 100%;
    max-width: 600px;
    text-align: center;
    box-sizing: border-box;
    position: relative;
    transition: background-color 0.5s ease, box-shadow 0.5s ease;
}

h2 {
    font-family: 'Poppins', sans-serif;
    color: var(--header-color);
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.05);
}

.slogan {
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 300;
    color: var(--text-color-secondary);
    margin-top: 0;
    margin-bottom: 2rem;
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color-main);
}

input[type="text"],
input[type="tel"],
input[type="password"],
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-color-main);
    color: var(--text-color-main);
    box-sizing: border-box;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input[type="text"]:focus,
input[type="tel"]:focus,
input[type="password"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.input-group {
    display: flex;
}

.input-group .prefix {
    background-color: var(--bg-color-main);
    border: 1px solid var(--input-border-color);
    border-right: none;
    padding: 12px;
    border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
    color: var(--text-color-secondary);
}

.input-group input {
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

input[type="submit"], .btn, .modal-btn {
    padding: 15px 25px;
    border: none;
    border-radius: var(--border-radius-sm);
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 1rem;
    box-shadow: var(--shadow-light);
}

input[type="submit"]:hover, .btn:hover, .modal-btn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#progress-container {
    width: 100%;
    background-color: var(--input-border-color);
    border-radius: 5px;
    margin-top: 1.5rem;
    display: none;
}

#progress-bar {
    height: 8px;
    width: 0%;
    background-color: var(--button-bg-color);
    border-radius: 5px;
    transition: width 0.4s ease;
}

#status-message {
    margin-top: 1.5rem;
    font-weight: 500;
    min-height: 20px;
}

#status-message.success {
    color: var(--success-color);
}

#status-message.error {
    color: var(--error-color);
}

.footer {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-color-secondary);
}

.footer a {
    color: var(--text-color-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: var(--header-color);
}

/* Dashboard Specific Styles */
.dashboard-intro {
    font-family: 'Inter', sans-serif;
    font-size: 1.1rem;
    font-weight: 400;
}

#dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

#logout-btn {
    width: auto;
    padding: 8px 15px;
    font-size: 0.9rem;
    display: inline-block;
    text-decoration: none;
}

.class-section {
    background-color: var(--bg-color-main);
    padding: 20px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 20px;
    text-align: left;
    box-shadow: var(--shadow-light);
    transition: box-shadow 0.3s ease;
}
.class-section:hover {
    box-shadow: var(--shadow-medium);
}

.class-section h3 {
    margin-top: 0;
    border-bottom: 1px solid var(--input-border-color);
    padding-bottom: 10px;
    font-family: 'Poppins', sans-serif;
    color: var(--header-color);
}

ul {
    list-style: none;
    padding: 0;
}

.submission-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--container-bg-color);
    padding: 15px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 10px;
    box-shadow: var(--shadow-light);
    flex-wrap: wrap;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.submission-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.submission-details {
    flex: 1;
    min-width: 200px;
}

.submission-details strong {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.submission-details small {
    display: block;
    color: var(--text-color-secondary);
    font-size: 0.75rem;
}

.submission-actions {
    display: flex;
    gap: 10px;
    margin-left: 20px;
    flex-shrink: 0;
}

.action-btn {
    background-color: var(--bg-color-main);
    border: 1px solid var(--input-border-color);
    color: var(--text-color-secondary);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.action-btn:hover {
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    transform: scale(1.1);
}

.notes-area {
    width: 100%;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed var(--input-border-color);
    animation: fadeIn 0.5s ease-in-out;
}

.notes-area textarea {
    min-height: 80px;
    margin-top: 10px;
    margin-bottom: 10px;
}

.notes-area .save-notes-btn {
    width: auto;
    padding: 8px 15px;
    font-size: 0.9rem;
    margin-top: 0;
}

.note-message {
    font-size: 0.9rem;
    margin-top: 10px;
    min-height: 20px;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease-in-out;
}

.modal-content {
    background-color: var(--container-bg-color);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    text-align: center;
    max-width: 400px;
    width: 90%;
    animation: popIn 0.3s ease-in-out;
}

.modal-content h4 {
    font-family: 'Poppins', sans-serif;
    color: var(--header-color);
    margin-top: 0;
    font-size: 1.5rem;
}

.modal-content p {
    color: var(--text-color-main);
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-btn {
    padding: 10px 20px;
    font-size: 0.9rem;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 0.5px;
    background-color: var(--input-border-color);
    color: var(--text-color-secondary);
    box-shadow: none;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.modal-btn:hover {
    transform: translateY(-1px);
}

.modal-btn.primary {
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
}
.modal-btn.primary:hover {
    background-color: var(--button-hover-color);
}

/* Keyframe Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes popIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}