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

:root {
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-surface-hover: #1a1a1a;
    --color-text: #e4e4e7;
    --color-text-secondary: #71717a;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-success: #22c55e;
    --color-success-bg: rgba(34, 197, 94, 0.12);
    --color-danger: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.12);
    --color-border: #27272a;
    --color-border-light: #3f3f46;
    --color-badge-bg: #1c1c1e;
    --color-card-shadow: 0 2px 8px rgba(0, 0, 0, 0.4), 0 0 1px rgba(255, 255, 255, 0.05);
    --color-card-shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 1px rgba(255, 255, 255, 0.08);
    --color-metallic: linear-gradient(135deg, #2c2c2e 0%, #3a3a3c 50%, #2c2c2e 100%);
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --transition: 0.2s ease;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --fab-sat-radius: 52px;
    --fab-sat-arc-start: 210deg;
    --fab-sat-arc-end: 0deg;
    --fab-sat-a0: 210deg;
    --fab-sat-a1: 140deg;
    --fab-sat-a2: 70deg;
    --fab-sat-a3: 0deg;
}

[data-theme="light"] {
    --color-bg: #f5f5f7;
    --color-surface: #ffffff;
    --color-surface-hover: #fafafa;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-success: #16a34a;
    --color-success-bg: #dcfce7;
    --color-danger: #ef4444;
    --color-danger-bg: #fef2f2;
    --color-border: #e5e7eb;
    --color-border-light: #d1d5db;
    --color-badge-bg: #f3f4f6;
    --color-card-shadow: 0 2px 8px rgba(0, 0, 0, 0.06), 0 0 1px rgba(0, 0, 0, 0.08);
    --color-card-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12), 0 0 1px rgba(0, 0, 0, 0.1);
    --color-metallic: none;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.header__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header__logo {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

.cart-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
}

.cart-overlay--active {
    opacity: 1;
    pointer-events: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition);
    border: 1px solid transparent;
}

.btn--primary {
    background: var(--color-primary);
    color: #ffffff;
}

.btn--primary:hover {
    background: var(--color-primary-hover);
}

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

.btn--outline {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn--outline:hover {
    background: var(--color-surface-hover);
}

.btn--disabled {
    background: var(--color-badge-bg);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    pointer-events: none;
}

.btn--sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

.btn--danger {
    background: var(--color-surface);
    color: var(--color-danger);
    border-color: var(--color-border);
}

.btn--danger:hover {
    background: var(--color-danger-bg);
}

.fab-group {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    z-index: 150;
}

.fab-cart {
    position: absolute;
    left: 0;
    top: 0;
    width: 56px;
    height: 56px;
    transform: translate(15px, 15px);
    border-radius: 50%;
    border: 2px solid rgba(192, 192, 192, 0.85);
    background: #1d1d1f;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow:
        0 4px 14px rgba(0, 0, 0, 0.35),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    z-index: 2;
    transition: transform var(--transition), box-shadow var(--transition);
}

[data-theme="light"] .fab-cart {
    background: #1d1d1f;
}

.fab-cart:hover {
    transform: translate(15px, 15px) scale(1.08);
    box-shadow:
        0 6px 20px rgba(0, 0, 0, 0.45),
        0 2px 6px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.fab-cart:active {
    transform: translate(15px, 15px) scale(0.96);
}

.fab-cart__badge {
    position: absolute;
    top: 2px;
    right: 2px;
    background: #ef4444;
    color: #ffffff;
    font-size: 0.625rem;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
    border: 2px solid #bcbcbd;
    line-height: 1;
}

.fab-cart__badge:empty {
    display: none;
}

.fab-sat {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #2c2c2e;
    color: #a1a1aa;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow:
        0 3px 10px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
    z-index: 1;
    transition: transform var(--transition), background var(--transition), color var(--transition);
    top: 50%;
    left: 50%;
    margin-top: -20px;
    margin-left: -20px;
}

.fab-sat[style*="--angle: 0"] {
    transform: translate(-43px, 25px);
}

.fab-sat[style*="--angle: 1"] {
    transform: translate(-38px, -32px);
}

.fab-sat[style*="--angle: 2"] {
    transform: translate(17px, -47px);
}

.fab-sat[style*="--angle: 3"] {
    transform: translate(72px, 0);
}

.fab-sat:hover {
    background: #3a3a3c;
    color: #ffffff;
}

.fab-sat[style*="--angle: 0"]:hover {
    transform: translate(-43px, 25px) scale(1.12);
}

.fab-sat[style*="--angle: 1"]:hover {
    transform: translate(-38px, -32px) scale(1.12);
}

.fab-sat[style*="--angle: 2"]:hover {
    transform: translate(17px, -47px) scale(1.12);
}

.fab-sat[style*="--angle: 3"]:hover {
    transform: translate(72px, 0) scale(1.12);
}

.theme-icon-sun {
    display: none;
}

.theme-icon-moon {
    display: block;
}

[data-theme="light"] .theme-icon-sun {
    display: block;
}

[data-theme="light"] .theme-icon-moon {
    display: none;
}

@media (max-width: 768px) {
    .main {
        padding: 20px 16px;
    }
}