/* CSS Custom Properties */
:root {
    --primary-bg: #0a0a0f;
    --secondary-bg: #141419;
    --card-bg: #1a1a24;
    --border-color: rgba(255, 255, 255, 0.1);

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;

    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;

    /* Note colors */
    --note-default: #2a2a3a;
    --note-red: #7f1d1d;
    --note-orange: #7c2d12;
    --note-yellow: #713f12;
    --note-green: #14532d;
    --note-blue: #1e3a5f;
    --note-purple: #3b0764;
    --note-pink: #831843;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==================== AUTH SCREEN ==================== */
.auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.auth-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.auth-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.auth-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.auth-glow-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-primary);
    top: -100px;
    right: -100px;
}

.auth-glow-2 {
    width: 300px;
    height: 300px;
    background: var(--accent-secondary);
    bottom: -50px;
    left: -50px;
}

.auth-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    padding: var(--spacing-xl);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin: var(--spacing-md);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-logo {
    width: 64px;
    height: 64px;
    background: var(--accent-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 1.75rem;
}

.auth-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    background: var(--secondary-bg);
    padding: 4px;
    border-radius: var(--radius-md);
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-family: inherit;
}

.auth-tab.active {
    background: var(--accent-primary);
    color: var(--text-primary);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.btn-fast-register {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    border: none;
    border-radius: var(--radius-md);
    color: #000;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: var(--transition-fast);
    font-family: inherit;
}

.btn-fast-register:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.form-divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.75rem;
}

.form-divider::before,
.form-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.auth-error {
    color: var(--error);
    font-size: 0.8rem;
    min-height: 1.2rem;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--text-primary);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-block {
    width: 100%;
    padding: 12px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
}

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

.btn-icon.active {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.btn-danger:hover {
    background: var(--error);
    color: var(--text-primary);
    border-color: var(--error);
}

/* ==================== HEADER ==================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header h1 i {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-badge {
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: 4px 10px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: inherit;
}

.user-badge:hover {
    background: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

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

/* ==================== MAIN & TOOLBAR ==================== */
.main-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    flex: 1;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 200px;
    max-width: 320px;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.search-box input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.color-filters {
    display: flex;
    align-items: center;
    gap: 4px;
}

.color-filter {
    padding: 6px 10px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.75rem;
    font-family: inherit;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

.color-filter:hover {
    border-color: var(--text-muted);
}

.color-filter.active {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.notes-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ==================== NOTES GRID ==================== */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.note-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 160px;
}

.note-card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.note-card.color-default { border-left: 3px solid var(--note-default); }
.note-card.color-red { border-left: 3px solid #ef4444; background: var(--note-red); }
.note-card.color-orange { border-left: 3px solid #f97316; background: var(--note-orange); }
.note-card.color-yellow { border-left: 3px solid #eab308; background: var(--note-yellow); }
.note-card.color-green { border-left: 3px solid #22c55e; background: var(--note-green); }
.note-card.color-blue { border-left: 3px solid #3b82f6; background: var(--note-blue); }
.note-card.color-purple { border-left: 3px solid #a855f7; background: var(--note-purple); }
.note-card.color-pink { border-left: 3px solid #ec4899; background: var(--note-pink); }

.note-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.note-card-title {
    font-size: 1rem;
    font-weight: 600;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.note-pin {
    color: var(--accent-primary);
    font-size: 0.8rem;
    flex-shrink: 0;
    margin-left: var(--spacing-sm);
}

.note-card-content {
    flex: 1;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    word-break: break-word;
}

.note-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.note-card-date {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ==================== MODAL ==================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
    backdrop-filter: blur(4px);
}

.modal {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 700px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.note-title-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    font-family: inherit;
    outline: none;
}

.note-title-input::placeholder {
    color: var(--text-muted);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.color-picker {
    display: flex;
    gap: 6px;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.color-option {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.color-option span {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: block;
}

.color-option:hover,
.color-option.active {
    border-color: var(--text-primary);
    transform: scale(1.15);
}

.note-content-input {
    flex: 1;
    min-height: 300px;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.7;
    resize: none;
    outline: none;
}

.note-content-input::placeholder {
    color: var(--text-muted);
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.note-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
    text-align: center;
    padding: 4rem var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    font-size: 0.9rem;
}

/* ==================== TOAST ==================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    animation: toastIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 250px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.success {
    background: var(--success);
    color: #fff;
}

.toast.error {
    background: var(--error);
    color: #fff;
}

.toast.info {
    background: var(--accent-primary);
    color: #fff;
}

.toast.credentials {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #000;
    flex-direction: column;
    align-items: flex-start;
    min-width: 300px;
    font-size: 0.8rem;
    padding: 16px;
}

.toast.credentials strong {
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.toast.credentials .cred-line {
    font-family: monospace;
    font-size: 0.85rem;
}

@keyframes toastIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ==================== ACCOUNT MODAL ==================== */
.account-modal {
    max-width: 480px;
}

.account-modal-title {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.account-modal-title i {
    color: var(--accent-primary);
}

.account-form-container {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    overflow-y: auto;
    max-height: 60vh;
}

.account-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.account-info-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.account-info-value {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.account-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .header h1 {
        font-size: 1rem;
    }

    .main {
        padding: var(--spacing-md);
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-left {
        flex-direction: column;
    }

    .search-box {
        max-width: none;
    }

    .color-filters {
        flex-wrap: wrap;
    }

    .toolbar-right {
        justify-content: space-between;
    }

    .notes-grid {
        grid-template-columns: 1fr;
    }

    .modal {
        max-height: 95vh;
    }

    .note-content-input {
        min-height: 200px;
    }

    .user-badge {
        font-size: 0;
        padding: 0;
        width: 36px;
        height: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .user-badge::before {
        content: '\f007';
        font-family: 'Font Awesome 6 Free';
        font-weight: 900;
        font-size: 0.85rem;
    }

    .back-btn span {
        display: none;
    }

    .note-card {
        min-height: 120px;
    }

    .note-card:hover {
        transform: none;
    }
}

@media (max-width: 380px) {
    .auth-container {
        padding: var(--spacing-md);
    }

    .color-filters {
        gap: 2px;
    }

    .color-filter {
        padding: 4px 6px;
    }
}