:root {
    --bg-primary: #1e293b;
    --bg-secondary: #0f172a;
    --border-color: #334155;
    --text-primary: #F9FAFB;
    --text-secondary: #94A3B8;
    --accent-primary: #3B82F6;
    --accent-hover: #2563EB;
    --danger-color: #EF4444;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.panel {
    background-color: var(--bg-primary);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.tab-button.active {
    border-bottom-color: var(--accent-primary);
    color: var(--accent-primary);
    font-weight: 600;
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
    background-color: #374151;
    border-color: #4B5563;
    color: var(--text-primary);
}

input[type="text"],
input[type="email"],
input[type="password"] {
    background-color: #1e293b;
    border: 1px solid #FFFFFF;
    color: #FFFFFF;
}

.recurrence-day-btn {
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    width: 2.5rem;
    height: 2.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.recurrence-day-btn.active {
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-hover);
}

input::placeholder { color: #94a3b8; }

input[type="color"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 2.5rem;
    height: 2.5rem;
    background-color: transparent;
    border: none;
    cursor: pointer;
}

input[type="color"]::-webkit-color-swatch {
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

input:focus, select:focus {
    --tw-ring-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#gemini-content ul { list-style-type: disc; margin-left: 1.25rem; }
#gemini-content li { margin-bottom: 0.5rem; }

.acao-avancar  { background-color: #10B981; color: white; }
.acao-revisao  { background-color: #FBBF24; color: #1F2937; }
.acao-aprofundar { background-color: #F97316; color: white; }
.acao-repetir  { background-color: #EF4444; color: white; }

p a { display: inline-block; }

/* Abas de matéria: multi-linha */
.master-tabs-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-bottom: 12px;
}

.master-tab-btn {
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    color: #94A3B8;
    white-space: nowrap;
    background-color: #0f172a;
    border: 1px solid #1e293b;
    border-left: 3px solid transparent;
    border-radius: 6px;
    padding: 6px 10px 6px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition:
        color 0.15s ease,
        background-color 0.15s ease,
        border-color 0.15s ease,
        box-shadow 0.15s ease;
    cursor: pointer;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.master-tab-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.master-tab-btn:hover {
    color: #e2e8f0;
    background-color: #1e293b;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.master-tab-btn.active-tab {
    color: #FFFFFF;
    font-weight: 700;
    background-color: #1e293b;
    box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.delete-subject-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    font-size: 0.85rem;
    line-height: 1;
    color: #475569;
    transition: background-color 0.15s, color 0.15s;
    flex-shrink: 0;
}
.delete-subject-btn:hover {
    background-color: rgba(239,68,68,0.2);
    color: #EF4444;
}

#user-id-display { display: none; }

#main-tabs {
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
#main-tabs::-webkit-scrollbar { display: none; }