/* ============================================
   VARIABLES Y RESET
   ============================================ */
:root {
    --bg: #0A0A0B;
    --surface: #141416;
    --surface-2: #1A1A1D;
    --surface-3: #232328;
    --border: #26262A;
    --border-light: #2F2F35;
    
    --text: #FAFAFA;
    --text-secondary: #A1A1AA;
    --text-tertiary: #71717A;
    
    --primary: #6366F1;
    --primary-hover: #7C7FEB;
    --primary-glow: rgba(99, 102, 241, 0.35);
    
    --violet: #8B5CF6;
    --success: #10B981;
    --success-glow: rgba(16, 185, 129, 0.25);
    --warning: #F59E0B;
    --warning-glow: rgba(245, 158, 11, 0.25);
    --danger: #EF4444;
    --danger-glow: rgba(239, 68, 68, 0.25);
    
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}

/* Efecto aurora sutil de fondo */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 80% 60%, rgba(139, 92, 246, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 50% 90%, rgba(16, 185, 129, 0.04) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
    animation: auroraMove 30s ease-in-out infinite alternate;
}

@keyframes auroraMove {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-2%, -2%) rotate(2deg); }
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--surface-3);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ============================================
   AUTH (Login / Register)
   ============================================ */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
    padding: 48px 40px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.5), transparent);
}

.auth-card h1 {
    font-size: 1.85rem;
    font-weight: 700;
    background: linear-gradient(135deg, #FAFAFA 0%, #A1A1AA 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 36px;
    font-size: 0.9rem;
}

/* ============================================
   FORMULARIOS
   ============================================ */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text);
    transition: all var(--transition);
}

.form-group input::placeholder {
    color: var(--text-tertiary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.form-group input[type="color"] {
    height: 46px;
    padding: 4px;
    cursor: pointer;
    background: var(--bg);
}

.form-group small {
    display: block;
    margin-top: 6px;
    font-size: 0.78rem;
    color: var(--text-tertiary);
}

.form-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 16px;
}

/* ============================================
   BOTONES
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--violet) 100%);
    color: white;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--primary-glow);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
    margin-top: 8px;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border-light);
}

/* ============================================
   AUTH LINKS
   ============================================ */
.auth-links {
    margin-top: 28px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.auth-links a {
    color: var(--primary-hover);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.auth-links a:hover {
    color: var(--text);
}

.auth-links .divider {
    margin: 0 12px;
    color: var(--border-light);
}

.demo-link {
    color: var(--success) !important;
}

.demo-link:hover {
    color: #34D399 !important;
}

/* ============================================
   ALERTAS
   ============================================ */
.alert {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 14px 24px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 1000;
    animation: slideDown 0.3s ease;
    max-width: 90%;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.alert-error {
    background: rgba(239, 68, 68, 0.15);
    color: #FCA5A5;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    color: #6EE7B7;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

@keyframes slideDown {
    from { opacity: 0; transform: translate(-50%, -20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

/* ============================================
   APP LAYOUT
   ============================================ */
.app-layout {
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(20, 20, 22, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 14px 32px;
}

.app-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.brand-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--violet) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.brand-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-pill {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px 6px 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--violet) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    text-transform: uppercase;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 32px 80px;
}

.page-title-block {
    margin-bottom: 32px;
}

.page-greeting {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    margin-bottom: 6px;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
}

.page-title em {
    font-family: 'Fraunces', serif;
    font-style: italic;
    font-weight: 500;
    background: linear-gradient(135deg, #FAFAFA 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   IDENTITY CARD
   ============================================ */
.identity-card {
    position: relative;
    padding: 28px 32px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.08) 100%);
    border: 1px solid rgba(99, 102, 241, 0.25);
    margin-bottom: 32px;
    overflow: hidden;
}

.identity-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.identity-label {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 700;
    color: var(--primary-hover);
    margin-bottom: 12px;
}

.identity-statement {
    font-family: 'Fraunces', serif;
    font-size: 1.35rem;
    font-weight: 500;
    font-style: italic;
    color: var(--text);
    line-height: 1.4;
    letter-spacing: -0.01em;
    position: relative;
    z-index: 1;
}

/* ============================================
   STATS GRID
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

.stat-card {
    padding: 22px 24px;
    border-radius: var(--radius);
    background: var(--surface);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    transition: all var(--transition);
}

.stat-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.stat-card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--surface-3);
    font-size: 1.1rem;
    margin-bottom: 14px;
}

.stat-card-primary .stat-card-icon {
    background: rgba(99, 102, 241, 0.15);
}

.stat-card-success .stat-card-icon {
    background: var(--success-glow);
}

.stat-card-warning .stat-card-icon {
    background: var(--warning-glow);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
    line-height: 1;
    margin-bottom: 6px;
    font-variant-numeric: tabular-nums;
}

.stat-card-primary .stat-value {
    background: linear-gradient(135deg, #A5B4FC 0%, #C4B5FD 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card-success .stat-value {
    color: var(--success);
}

.stat-card-warning .stat-value {
    color: var(--warning);
}

.stat-label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-tertiary);
    font-weight: 500;
    letter-spacing: 0.01em;
}

/* ============================================
   SECCIÓN DE HÁBITOS
   ============================================ */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-title {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.section-title h2 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

.section-count {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    font-weight: 500;
    padding: 2px 10px;
    background: var(--surface);
    border-radius: 999px;
    border: 1px solid var(--border);
}

.habits-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.habit-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-radius: var(--radius);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.habit-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: transparent;
    transition: background var(--transition);
}

.habit-card:hover {
    border-color: var(--border-light);
    background: var(--surface-2);
}

.habit-card.completed {
    border-color: rgba(16, 185, 129, 0.3);
    background: linear-gradient(90deg, rgba(16, 185, 129, 0.06) 0%, var(--surface) 50%);
}

.habit-card.completed::before {
    background: linear-gradient(180deg, var(--success), #34D399);
    box-shadow: 0 0 12px var(--success-glow);
}

/* Check button */
.habit-check {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-light);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    transition: all var(--transition);
    position: relative;
}

.habit-check:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.habit-card.completed .habit-check {
    background: var(--success);
    border-color: var(--success);
    box-shadow: 0 0 16px var(--success-glow);
}

/* Habit icon */
.habit-icon-wrap {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    position: relative;
}

/* Info */
.habit-info {
    flex: 1;
    min-width: 0;
}

.habit-name {
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    letter-spacing: -0.01em;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.habit-card.completed .habit-name {
    color: var(--text-tertiary);
    text-decoration: line-through;
    text-decoration-color: var(--text-tertiary);
}

.habit-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    flex-wrap: wrap;
}

.habit-type-badge {
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.type-positive {
    background: rgba(99, 102, 241, 0.15);
    color: #A5B4FC;
}

.type-negative {
    background: rgba(239, 68, 68, 0.15);
    color: #FCA5A5;
}

.habit-cue {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* Stats y acciones */
.habit-right {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-shrink: 0;
}

.habit-stats-mini {
    display: flex;
    gap: 16px;
}

.habit-stat-mini {
    text-align: center;
    min-width: 40px;
}

.habit-stat-mini .value {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.habit-stat-mini .label {
    display: block;
    font-size: 0.65rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 2px;
}

.habit-stat-mini.streak .value {
    color: var(--warning);
}

.habit-stat-mini.total .value {
    color: var(--text-secondary);
}

.habit-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition);
}

.habit-card:hover .habit-actions {
    opacity: 1;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--text-tertiary);
    transition: all var(--transition);
}

.btn-icon:hover {
    background: var(--surface-3);
    color: var(--text);
}

.btn-icon.btn-danger:hover {
    background: rgba(239, 68, 68, 0.15);
    color: #FCA5A5;
}

.btn-icon.btn-two-min:hover {
    background: rgba(245, 158, 11, 0.15);
    color: #FCD34D;
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: 72px 32px;
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border-light);
    position: relative;
    overflow: hidden;
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.empty-state p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   FORMS DE HÁBITOS
   ============================================ */
.habit-form {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow);
}

.form-section {
    margin-bottom: 36px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--border);
}

.form-section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}

.form-section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.form-section-title span {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.form-help {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 28px;
    padding-top: 28px;
    border-top: 1px solid var(--border);
}

.page-header {
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.btn-back:hover {
    color: var(--text);
    border-color: var(--border-light);
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .app-header {
        padding: 12px 16px;
    }
    .app-main {
        padding: 24px 16px 60px;
    }
    .page-title {
        font-size: 1.5rem;
    }
    .identity-statement {
        font-size: 1.1rem;
    }
    .habit-card {
        flex-wrap: wrap;
        gap: 12px;
        padding: 14px 16px;
    }
    .habit-right {
        width: 100%;
        justify-content: space-between;
        padding-left: 52px;
    }
    .habit-actions {
        opacity: 1;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .habit-form {
        padding: 24px 20px;
    }
    .brand-name {
        display: none;
    }
    .user-pill {
        padding: 4px;
    }
    .user-pill span:not(.user-avatar) {
        display: none;
    }
}