@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;600;800&display=swap');

:root {
    --primary: #e11d48;
    --primary-hover: #be123c;
    --secondary: #f43f5e;
    --accent: #fb7185;
    --bg-main: #ffffff;
    --bg-sidebar: #fdfdfd;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --glass: rgba(255, 255, 255, 0.8);
    --border: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 16px;
    --accent-subtle: #fff1f2;
    --bg-icon-opacity: 0.12;
}

[data-theme="dark"] {
    --primary: #f43f5e;
    --primary-hover: #e11d48;
    --bg-main: #000000;
    --bg-sidebar: #0a0a0a;
    --text-main: #ffffff;
    --text-muted: #94a3b8;
    --glass: rgba(0, 0, 0, 0.7);
    --border: #1a1a1a;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.7);
    --accent-subtle: #2d0a0a;
    --bg-icon-opacity: 0.25;
}

[data-theme="dark"] input[type="date"]::-webkit-calendar-picker-indicator,
[data-theme="dark"] input[type="time"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
}

body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: transparent;
    color: var(--text-main);
    overflow-x: hidden;
    height: 100vh;
    display: flex;
}

/* Sidebar Navigation */
.sidebar {
    width: 280px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    position: sticky;
    top: 0;
    transition: all 0.3s ease;
    z-index: 2;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 3rem;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    color: var(--text-muted);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-item:hover, .nav-item.active {
    background: var(--glass);
    color: var(--primary);
}

.nav-item.active {
    background: var(--glass);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Main Content Area */
main {
    flex: 1;
    overflow-y: auto;
    padding: 2.5rem;
    position: relative;
    background: transparent;
    z-index: 1;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

/* Typography */
h1, h2, h3 {
    font-family: 'Outfit', sans-serif;
    margin-bottom: 1.5rem;
}

h1 { font-size: 2.25rem; font-weight: 800; color: var(--text-main); }
h2 { font-size: 1.5rem; font-weight: 700; color: var(--text-main); }
h3 { font-size: 1.25rem; font-weight: 600; color: var(--text-main); }

/* Sections */
.section {
    display: none;
    animation: slideUp 0.4s ease-out;
}

.section.active {
    display: block;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards & Components */
.grid-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.card {
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    color: var(--text-main);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.glass-card {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* Specific Feature: Pomodoro */
.timer-container {
    text-align: center;
    padding: 2.5rem;
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.timer-display {
    font-size: 4rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    margin: 1rem 0;
}

/* Tutors List */
#tutorsList {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.tutor-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.tutor-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--accent-subtle);
    color: var(--primary);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
}

/* Form Styles */
form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 500px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

input, select, textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    outline: none;
    transition: all 0.2s ease;
    background: var(--bg-main);
    color: var(--text-main);
    font-size: 0.95rem;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23e11d48'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.25rem;
    padding-right: 3rem;
    cursor: pointer;
}

select:hover {
    border-color: var(--primary);
    background-color: var(--accent-subtle);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
    transform: translateY(-2px);
    background-color: var(--bg-sidebar);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    body { flex-direction: column; }
    .sidebar { width: 100%; height: auto; padding: 1rem; border-right: none; border-bottom: 1px solid var(--border); position: relative; }
    .nav-links { flex-direction: row; overflow-x: auto; padding-bottom: 0.5rem; }
    .logo { margin-bottom: 1rem; }
    main { padding: 1.5rem; }
}

/* Animations */
.hover-scale:hover { transform: scale(1.02); }

.logout-item:hover i {
    animation: logoutShake 0.5s ease-in-out infinite;
}

@keyframes logoutShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

.fade-out {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
    filter: blur(10px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

/* Academic Background Animation */
.academic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
    background: var(--bg-main);
}

.floating-icon {
    position: absolute;
    color: var(--primary);
    opacity: 0;
    animation: floatAcademic var(--duration) linear infinite;
    font-size: var(--size);
    top: 0;
    left: var(--left);
    pointer-events: none;
    filter: drop-shadow(0 0 2px var(--primary));
}

.floating-icon.alternate {
    animation-name: floatAcademicAlternate;
}

.formula {
    position: absolute;
    color: var(--primary);
    opacity: 0;
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: var(--size);
    white-space: nowrap;
    pointer-events: none;
    animation: floatAcademic var(--duration) linear infinite;
    top: 0;
    left: var(--left);
}

@keyframes floatAcademic {
    0% {
        transform: translateY(110vh) rotate(0deg) translateX(0);
        opacity: 0;
    }
    15% {
        opacity: var(--bg-icon-opacity);
    }
    50% {
        transform: translateY(50vh) rotate(180deg) translateX(40px);
    }
    85% {
        opacity: var(--bg-icon-opacity);
    }
    100% {
        transform: translateY(-20vh) rotate(360deg) translateX(-20px);
        opacity: 0;
    }
}

@keyframes floatAcademicAlternate {
    0% {
        transform: translateY(110vh) rotate(360deg) translateX(0);
        opacity: 0;
    }
    15% {
        opacity: var(--bg-icon-opacity);
    }
    50% {
        transform: translateY(50vh) rotate(180deg) translateX(-40px);
    }
    85% {
        opacity: var(--bg-icon-opacity);
    }
    100% {
        transform: translateY(-20vh) rotate(0deg) translateX(20px);
        opacity: 0;
    }
}

/* Chalkboard effect for certain elements */
.chalk {
    filter: blur(0.5px);
    opacity: 0.15;
}

[data-theme="dark"] .chalk {
    opacity: 0.25;
}

/* Calendar Component */
.calendar-widget {
    background: var(--bg-sidebar);
    border-radius: var(--radius);
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 0.85rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    color: var(--text-main);
}

.calendar-day:hover:not(:empty) {
    background: var(--accent-subtle);
    transform: scale(1.1);
}

.calendar-day.today {
    background: var(--primary) !important;
    color: white !important;
    font-weight: 800;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.calendar-day.has-event {
    border: 2px solid var(--accent);
    color: var(--accent);
    font-weight: 700;
}