/* ========== Variabel CSS ========== */
:root {
    /* Light Theme (Default) */
    --bg-color: #f4f7fb;
    --card-bg: #ffffff;
    --text-main: #2d3748;
    --text-muted: #718096;
    
    /* Warna Utama */
    --primary: #4299e1; /* Biru muda */
    --primary-hover: #3182ce;
    --success: #48bb78; /* Hijau pastel */
    --success-hover: #38a169;
    --warning: #ecc94b;
    --warning-hover: #d69e2e;
    --danger: #f56565;
    --danger-hover: #e53e3e;
    --info: #0bc5ea;
    --info-hover: #00b5d8;
    
    /* UI Elements */
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 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: 14px;
    
    /* Progress */
    --progress-bg: #edf2f7;
    --progress-fill: var(--success);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-color: #1a202c;
    --card-bg: #2d3748;
    --text-main: #f7fafc;
    --text-muted: #a0aec0;
    --border-color: #4a5568;
    --progress-bg: #4a5568;
}

/* ========== Reset & Base ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ========== Utilities ========== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1.5rem; }
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-primary { color: var(--primary); font-weight: 600; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* ========== Header ========== */
.app-header {
    background-color: var(--card-bg);
    padding: 1.5rem 0;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.clock {
    font-family: monospace;
    font-size: 1.1rem;
    font-weight: 600;
    background-color: var(--bg-color);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: transform 0.2s, background-color 0.2s;
    color: var(--text-main);
}
.btn-icon:hover {
    transform: scale(1.1);
    background-color: var(--bg-color);
}

/* ========== Card & Layout ========== */
.card {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}
.card:hover {
    box-shadow: var(--shadow-lg);
}

main {
    padding: 2rem 0 4rem 0;
}

/* ========== Forms ========== */
.form-group {
    margin-bottom: 1.5rem;
}
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-main);
}
input[type="text"], input[type="number"] {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}
.error-msg {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 0.4rem;
    display: none;
}
input:invalid:not(:placeholder-shown) + .error-msg {
    display: block;
}

/* ========== Buttons ========== */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
.btn-block {
    width: 100%;
}
.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover); transform: translateY(-1px); }

.btn-secondary { background-color: var(--text-muted); color: white; }
.btn-secondary:hover:not(:disabled) { opacity: 0.9; }

.btn-success { background-color: var(--success); color: white; }
.btn-success:hover:not(:disabled) { background-color: var(--success-hover); }

.btn-warning { background-color: var(--warning); color: #1a202c; }
.btn-warning:hover:not(:disabled) { background-color: var(--warning-hover); }

.btn-danger { background-color: var(--danger); color: white; }
.btn-danger:hover:not(:disabled) { background-color: var(--danger-hover); }

.btn-info { background-color: var(--info); color: white; }
.btn-info:hover:not(:disabled) { background-color: var(--info-hover); }

.btn-outline {
    background-color: transparent;
    border: 1px solid currentColor;
    color: inherit;
}
.btn-danger.btn-outline { color: var(--danger); border-color: var(--danger); background: transparent; }
.btn-danger.btn-outline:hover { background: var(--danger); color: white; }

/* ========== Dashboard Grid ========== */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
    align-items: start;
}

/* ========== Statistics ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}
.stat-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s;
}
.stat-card:hover {
    transform: translateY(-2px);
}
.stat-card h4 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.stat-card p {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

/* ========== AI Partner ========== */
.ai-partner-card {
    background: linear-gradient(135deg, rgba(66, 153, 225, 0.1) 0%, rgba(72, 187, 120, 0.1) 100%);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}
.ai-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.ai-icon {
    font-size: 1.8rem;
    background-color: var(--card-bg);
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}
.ai-content p {
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}
.ai-message {
    font-style: italic;
    color: var(--text-main);
    line-height: 1.7;
    position: relative;
    padding-left: 1rem;
    border-left: 4px solid var(--success);
}

/* ========== Schedule List ========== */
.schedule-actions {
    display: flex;
    gap: 0.5rem;
}
.schedule-list {
    max-height: 500px;
    overflow-y: auto;
    padding-right: 0.5rem;
}
/* Custom Scrollbar */
.schedule-list::-webkit-scrollbar { width: 6px; }
.schedule-list::-webkit-scrollbar-track { background: var(--bg-color); border-radius: 10px; }
.schedule-list::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 10px; }
.schedule-list::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    transition: all 0.2s ease;
}
.session-item.break {
    background-color: rgba(236, 201, 75, 0.1);
    border-left: 4px solid var(--warning);
}
.session-item.study {
    border-left: 4px solid var(--primary);
}
.session-item.completed {
    background-color: rgba(72, 187, 120, 0.1);
    border-left-color: var(--success);
    opacity: 0.8;
}
.session-item:hover {
    transform: translateX(2px);
    box-shadow: var(--shadow-sm);
}
.session-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}
.session-number {
    background-color: var(--card-bg);
    color: var(--text-muted);
    font-weight: 600;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}
.session-details strong {
    display: block;
    margin-bottom: 0.2rem;
}
.session-details span {
    font-size: 0.85rem;
    color: var(--text-muted);
}
/* Checkbox Styling */
.session-checkbox {
    width: 22px;
    height: 22px;
    cursor: pointer;
    accent-color: var(--success);
}

/* ========== Progress Bar ========== */
.progress-bar-bg {
    width: 100%;
    height: 12px;
    background-color: var(--progress-bg);
    border-radius: 10px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background-color: var(--progress-fill);
    width: 0%;
    border-radius: 10px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background-image: linear-gradient(45deg,rgba(255,255,255,.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.15) 50%,rgba(255,255,255,.15) 75%,transparent 75%,transparent);
    background-size: 1rem 1rem;
}

/* ========== Focus Timer ========== */
.timer-display-wrapper {
    background-color: var(--bg-color);
    padding: 3rem 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}
.timer-display {
    font-size: 5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--text-main);
    line-height: 1;
    letter-spacing: 2px;
}
.timer-status {
    font-size: 1.2rem;
    margin-top: 1rem;
}
.timer-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* ========== Toast ========== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--text-main);
    color: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    font-weight: 500;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* ========== Animations ========== */
.fade-in {
    animation: fadeIn 0.5s ease forwards;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== Responsive Design ========== */
@media (max-width: 992px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .timer-container {
        order: -1; /* Pindahkan timer ke atas di mobile */
    }
}

@media (max-width: 600px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    .timer-display {
        font-size: 4rem;
    }
    .timer-controls {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ========== Chatbot ========== */
.floating-chat-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary);
    color: white;
    font-size: 1.8rem;
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    z-index: 1000;
    transition: transform 0.2s, background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.floating-chat-btn:hover {
    transform: scale(1.1);
    background-color: var(--primary-hover);
}

.chatbot-container {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 350px;
    max-width: calc(100vw - 40px);
    background-color: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform-origin: bottom right;
    transition: all 0.3s ease;
}
.chatbot-container.hidden {
    display: none !important;
}

.chatbot-header {
    background-color: var(--primary);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.chatbot-header h4 { margin: 0; font-size: 1rem; }
.chatbot-header .btn-icon { color: white; font-size: 1rem; padding: 0.2rem; }
.chatbot-header .btn-icon:hover { background-color: rgba(255,255,255,0.2); }

.chatbot-messages {
    height: 300px;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    background-color: var(--bg-color);
}
.message {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-size: 0.9rem;
    line-height: 1.4;
}
.ai-message-bubble {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
}
.user-message-bubble {
    background-color: var(--primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

.chatbot-input {
    display: flex;
    padding: 1rem;
    gap: 0.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--card-bg);
}
.chatbot-input input {
    flex: 1;
    padding: 0.6rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-main);
}
.chatbot-input input:focus {
    outline: none;
    border-color: var(--primary);
}