/* ===== CSS Variables & Design Tokens ===== */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(17, 24, 39, 0.85);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-hover: rgba(255, 255, 255, 0.15);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-cyan: #06b6d4;
    --accent-cyan-glow: rgba(6, 182, 212, 0.3);
    --accent-purple: #a855f7;
    --accent-purple-glow: rgba(168, 85, 247, 0.3);
    --accent-green: #22c55e;
    --accent-green-glow: rgba(34, 197, 94, 0.3);
    --accent-red: #ef4444;
    --accent-red-glow: rgba(239, 68, 68, 0.3);
    --accent-amber: #f59e0b;

    --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    --gradient-success: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow-cyan: 0 0 30px var(--accent-cyan-glow);
    --shadow-glow-purple: 0 0 30px var(--accent-purple-glow);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== Animated Background ===== */
.background-effects {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.glow-1 {
    width: 500px;
    height: 500px;
    background: var(--accent-cyan);
    top: -150px;
    right: -100px;
    opacity: 0.15;
    animation-delay: 0s;
}

.glow-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-purple);
    bottom: -100px;
    left: -100px;
    opacity: 0.12;
    animation-delay: -7s;
}

.glow-3 {
    width: 300px;
    height: 300px;
    background: var(--accent-green);
    top: 50%;
    left: 50%;
    opacity: 0.08;
    animation-delay: -14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(30px, -40px) scale(1.05);
    }

    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }

    75% {
        transform: translate(40px, 30px) scale(1.02);
    }
}

/* ===== Navigation ===== */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo {
    font-size: 1.6rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse-logo 3s ease-in-out infinite;
}

@keyframes pulse-logo {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

.nav-title {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-tabs {
    display: flex;
    gap: 4px;
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    position: relative;
}

.nav-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-tab.active {
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
}

.tab-icon {
    font-size: 1rem;
}

/* ===== Container ===== */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

/* ===== Page Header ===== */
.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ===== Counter Badge ===== */
.counter {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 1rem;
    padding: 6px 16px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
}

.counter-number {
    font-weight: 700;
    color: var(--accent-cyan);
    font-size: 1.1rem;
}

.counter-label {
    color: var(--text-secondary);
}

.completed-counter {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.2);
}

.completed-counter .counter-number {
    color: var(--accent-green);
}

/* ===== Card ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--border-glass-hover);
}

/* ===== Form Card ===== */
.form-card {
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.label-icon {
    font-size: 0.95rem;
}

.optional {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.8rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    transition: all var(--transition-normal);
    outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px var(--accent-cyan-glow);
    background: rgba(255, 255, 255, 0.06);
}

.form-group input.error,
.form-group textarea.error {
    border-color: var(--accent-red);
    box-shadow: 0 0 0 3px var(--accent-red-glow);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.field-hint {
    display: block;
    margin-top: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    width: 100%;
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow-cyan);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.btn-primary:hover::before {
    transform: translateX(100%);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 40px var(--accent-cyan-glow);
}

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

.btn-content,
.btn-loading {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon {
    font-size: 1.1rem;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

.btn-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.btn-success:hover {
    background: rgba(34, 197, 94, 0.25);
    box-shadow: 0 0 20px var(--accent-green-glow);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.25);
    box-shadow: 0 0 20px var(--accent-red-glow);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-glass);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* ===== Spinner ===== */
.spinner {
    display: inline-block;
    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;
}

.spinner.large {
    width: 32px;
    height: 32px;
    border-width: 3px;
    border-color: rgba(6, 182, 212, 0.2);
    border-top-color: var(--accent-cyan);
}

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

/* ===== List Items ===== */
.list-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.list-item {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-normal);
    animation: slideIn 0.4s ease backwards;
}

.list-item:hover {
    border-color: var(--border-glass-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.list-item-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.list-item-info {
    flex: 1;
    min-width: 0;
}

.list-item-position {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-cyan);
    flex-shrink: 0;
    margin-right: 10px;
}

.list-item-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.list-item-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 4px;
    transition: color var(--transition-fast);
    word-break: break-all;
}

.list-item-link:hover {
    color: var(--accent-purple);
}

.list-item-link::before {
    content: '🔗';
    font-size: 0.8rem;
}

.list-item-description {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 6px;
    line-height: 1.5;
}

.list-item-thumb {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.list-item-thumb:hover {
    transform: scale(1.08);
}

.list-item-model {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-purple);
    margin-top: 2px;
    line-height: 1.4;
}

.quantity-badge {
    display: inline-flex;
    align-items: center;
    padding: 1px 8px;
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-amber);
    letter-spacing: 0.03em;
}

.list-item-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-glass);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.list-item-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

/* Completed items styling */
.list-item.completed {
    border-left: 3px solid var(--accent-green);
}

.completed-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: rgba(34, 197, 94, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-green);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Loading & Empty State ===== */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 3rem;
}

.empty-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-lg), 0 0 30px var(--accent-green-glow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 1000;
    animation: toastIn 0.4s ease forwards;
    font-size: 0.9rem;
}

.toast.error {
    border-color: rgba(239, 68, 68, 0.3);
    box-shadow: var(--shadow-lg), 0 0 30px var(--accent-red-glow);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }

    to {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 400px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.modal h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.modal p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.modal-actions .btn {
    min-width: 100px;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .nav {
        padding: 0 1rem;
        flex-direction: column;
        height: auto;
        padding: 0.75rem 1rem;
        gap: 8px;
    }

    .nav-tabs {
        width: 100%;
        justify-content: center;
    }

    .nav-tab {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .tab-label {
        display: none;
    }

    .tab-icon {
        font-size: 1.2rem;
    }

    .container {
        padding: 1.5rem 1rem 3rem;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .form-card {
        padding: 1.25rem;
    }

    .list-item-header {
        flex-direction: column;
    }

    .list-item-actions {
        align-self: flex-end;
    }
}