/* ===================================
   CSS Variables & Theme
   =================================== */
:root {
    /* Background Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-hover: #22222f;

    /* Text Colors */
    --text-primary: #f0f0f5;
    --text-secondary: #9090a0;
    --text-muted: #606070;

    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);

    /* Status Colors */
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.15);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.15);

    /* Message Colors */
    --incoming-bg: #1e293b;
    --outgoing-bg: #312e81;

    /* Border & Shadow */
    --border-color: #2a2a3a;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

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

/* ===================================
   Auth Layout
   =================================== */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
    background: radial-gradient(circle at top, #1b1b2a 0%, #0a0a0f 60%);
}

.auth-shell {
    width: min(420px, 100%);
}

.auth-shell .flash-messages {
    margin-bottom: 16px;
}

.auth-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
}

.auth-card .page-header {
    margin-bottom: 20px;
}

/* ===================================
   Sidebar Navigation
   =================================== */
.sidebar {
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-base);
}

.sidebar.mobile-hidden {
    transform: translateX(-100%);
}

.logo {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo span {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
    display: block;
    margin-top: 2px;
}

.nav-menu {
    padding: 16px 12px;
    flex: 1;
    overflow-y: auto;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    margin-bottom: 4px;
    transition: all var(--transition-base);
    font-weight: 500;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateX(2px);
}

.nav-link.active {
    background: var(--accent-glow);
    color: var(--accent-secondary);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.nav-link:hover svg {
    opacity: 1;
}

.nav-badge {
    margin-left: auto;
    background: var(--accent-primary);
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
}

.nav-section {
    margin-bottom: 16px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 16px;
    margin-top: 16px;
}

.new-message-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: calc(100% - 24px);
    margin: 0 12px 16px;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px var(--accent-glow);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.new-message-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px var(--accent-glow);
    animation: none;
}

.new-message-btn svg {
    width: 18px;
    height: 18px;
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.sidebar-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
}

.sidebar-footer a:hover {
    color: var(--text-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 101;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.mobile-menu-toggle:hover {
    background: var(--bg-hover);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
    display: block;
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 99;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-overlay.active {
    opacity: 1;
}

/* ===================================
   Main Content Area
   =================================== */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 32px;
    background:
        radial-gradient(ellipse at top right, rgba(99, 102, 241, 0.08), transparent 50%),
        radial-gradient(ellipse at bottom left, rgba(129, 140, 248, 0.05), transparent 50%),
        var(--bg-primary);
    transition: margin-left var(--transition-base);
}

.page-header {
    margin-bottom: 32px;
}

.page-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===================================
   Cards
   =================================== */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover {
    border-color: rgba(99, 102, 241, 0.3);
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
}

.card-body {
    padding: 24px;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

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

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

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

.btn-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* ===================================
   Forms & Inputs
   =================================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-label .required {
    color: var(--error);
    margin-left: 4px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input.error,
.form-textarea.error,
.form-select.error {
    border-color: var(--error);
}

.form-input.success {
    border-color: var(--success);
}

.form-error {
    display: none;
    color: var(--error);
    font-size: 13px;
    margin-top: 6px;
    animation: slideDown 0.2s ease;
}

.form-error.visible {
    display: block;
}

.form-hint {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 6px;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Filter Tabs
   =================================== */
.filter-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    padding: 4px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    width: fit-content;
}

.filter-tab {
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.filter-tab:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.filter-tab.active {
    background: var(--accent-primary);
    color: white;
}

/* ===================================
   Flash Messages
   =================================== */
.flash-messages {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 400px;
}

.flash {
    padding: 14px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.flash-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.flash-error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.flash-warning {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.flash-info {
    background: var(--info-bg);
    color: var(--info);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* ===================================
   Loading States
   =================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 15, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    backdrop-filter: blur(4px);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-primary);
    margin-top: 16px;
    font-size: 14px;
    text-align: center;
}

/* Inline loading spinner for buttons */
.btn .spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: none;
}

.btn.loading .spinner {
    display: block;
}

.btn.loading .btn-text {
    display: none;
}

/* ===================================
   Success Checkmark Animation
   =================================== */
.success-checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto;
}

.success-checkmark .check-icon {
    width: 80px;
    height: 80px;
    position: relative;
    border-radius: 50%;
    box-sizing: content-box;
    border: 4px solid var(--success);
}

.success-checkmark .check-icon::before {
    top: 3px;
    left: -2px;
    width: 30px;
    transform-origin: 100% 50%;
    border-radius: 100px 0 0 100px;
}

.success-checkmark .check-icon::after {
    top: 0;
    left: 30px;
    width: 60px;
    transform-origin: 0 50%;
    border-radius: 0 100px 100px 0;
    animation: rotate-circle 4.25s ease-in;
}

.success-checkmark .check-icon::before,
.success-checkmark .check-icon::after {
    content: '';
    height: 100px;
    position: absolute;
    background: var(--bg-primary);
    transform: rotate(-45deg);
}

.success-checkmark .icon-line {
    height: 5px;
    background-color: var(--success);
    display: block;
    border-radius: 2px;
    position: absolute;
    z-index: 10;
}

.success-checkmark .icon-line.line-tip {
    top: 46px;
    left: 14px;
    width: 25px;
    transform: rotate(45deg);
    animation: icon-line-tip 0.75s;
}

.success-checkmark .icon-line.line-long {
    top: 38px;
    right: 8px;
    width: 47px;
    transform: rotate(-45deg);
    animation: icon-line-long 0.75s;
}

@keyframes icon-line-tip {
    0% {
        width: 0;
        left: 1px;
        top: 19px;
    }
    54% {
        width: 0;
        left: 1px;
        top: 19px;
    }
    70% {
        width: 50px;
        left: -8px;
        top: 37px;
    }
    84% {
        width: 17px;
        left: 21px;
        top: 48px;
    }
    100% {
        width: 25px;
        left: 14px;
        top: 45px;
    }
}

@keyframes icon-line-long {
    0% {
        width: 0;
        right: 46px;
        top: 54px;
    }
    65% {
        width: 0;
        right: 46px;
        top: 54px;
    }
    84% {
        width: 55px;
        right: 0px;
        top: 35px;
    }
    100% {
        width: 47px;
        right: 8px;
        top: 38px;
    }
}

/* ===================================
   Modal/Dialog
   =================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.modal-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* ===================================
   Empty State
   =================================== */
.empty-state {
    text-align: center;
    padding: 60px 24px;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

/* ===================================
   Utility Classes
   =================================== */
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-info { color: var(--info); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }
.bg-tertiary { background: var(--bg-tertiary); }

.font-mono { font-family: 'JetBrains Mono', monospace; }

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }

.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }

.p-1 { padding: 4px; }
.p-2 { padding: 8px; }
.p-3 { padding: 12px; }
.p-4 { padding: 16px; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none; }

/* ===================================
   Responsive Design - Mobile
   =================================== */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .mobile-overlay {
        display: block;
    }

    .main-content {
        margin-left: 0;
        padding: 72px 16px 16px;
    }

    .page-title {
        font-size: 24px;
    }

    .card-body {
        padding: 16px;
    }

    .filter-tabs {
        width: 100%;
        overflow-x: auto;
        flex-wrap: nowrap;
    }

    .flash-messages {
        left: 16px;
        right: 16px;
        top: 72px;
        max-width: none;
    }

    /* Touch-friendly buttons */
    .btn {
        min-height: 44px;
        padding: 12px 20px;
    }

    .btn-sm {
        min-height: 36px;
        padding: 8px 14px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 64px 12px 12px;
    }

    .page-title {
        font-size: 20px;
    }

    .modal {
        width: 95%;
    }
}

/* ===================================
   Animations & Transitions
   =================================== */
.fade-in {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-in-left {
    animation: slideInLeft 0.3s ease;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.3s ease;
}

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

.scale-in {
    animation: scaleIn 0.2s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}