/* ==========================================================================
   비온뒤하늘 책방 — 디자인 시스템
   컨셉: "비 온 뒤 하늘" — 차분한 색감, 종이 질감의 아늑한 독서 공간
   ========================================================================== */

:root {
    /* --- Color: brand --- */
    --color-primary: #5B7C99;          /* dusty sky blue */
    --color-primary-hover: #4A6A85;
    --color-primary-light: #E8EEF2;    /* tint: active/hover bg, badges */
    --color-primary-lighter: #F1F5F7;

    --color-accent: #E8927C;           /* warm terracotta */
    --color-accent-hover: #DB7E66;
    --color-accent-light: #FBEAE4;

    /* --- Color: surfaces --- */
    --color-bg: #FBF9F4;               /* warm paper cream — page background */
    --color-surface: #FFFFFF;          /* card / panel background */
    --color-surface-alt: #F5F1E8;      /* input bg, alternating sections */
    --color-surface-hover: #FDFBF7;

    /* --- Color: text --- */
    --color-text: #33302A;             /* warm near-black */
    --color-text-secondary: #7A756B;   /* warm gray */
    --color-text-muted: #A39E92;       /* placeholders, meta, disabled */
    --color-text-on-primary: #FFFFFF;

    /* --- Color: borders --- */
    --color-border: #E8E2D5;
    --color-border-strong: #D8CFBC;

    /* --- Color: state --- */
    --color-success: #6B9080;
    --color-success-light: #E7EFEA;
    --color-error: #BC4B3C;
    --color-error-light: #F8E9E6;
    --color-warning: #D9A441;
    --color-warning-light: #FBF1DE;

    /* --- Typography --- */
    --font-display: 'Gowun Batang', 'Noto Serif KR', serif;
    --font-body: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;

    /* --- Radius --- */
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 999px;

    /* --- Shadow (warm-toned, diffuse) --- */
    --shadow-sm: 0 2px 8px rgba(91, 60, 12, 0.06);
    --shadow-md: 0 4px 20px rgba(91, 60, 12, 0.08);
    --shadow-lg: 0 10px 30px rgba(91, 60, 12, 0.12);
    --shadow-hover: 0 12px 28px rgba(232, 146, 124, 0.20);

    /* --- Spacing --- */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;

    /* --- Motion --- */
    --transition: all 0.25s ease;

    /* --- Layout --- */
    --container-width: 1200px;
}

/* ==========================================================================
   Base
   ========================================================================== */

* {
    box-sizing: border-box;
}

body {
    background-color: var(--color-bg);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
    color: var(--color-text);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .font-display {
    font-family: var(--font-display);
    color: var(--color-text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-accent);
}

::selection {
    background: var(--color-primary-light);
    color: var(--color-text);
}

/* 스크롤바 (webkit) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-surface-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    border: none;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none !important;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-on-primary) !important;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-accent {
    background: var(--color-accent);
    color: #fff !important;
    box-shadow: var(--shadow-sm);
}

.btn-accent:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary) !important;
    border: 1.5px solid var(--color-primary);
}

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

.btn-ghost {
    background: var(--color-surface-alt);
    color: var(--color-text) !important;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"],
select,
textarea,
.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-surface-alt);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--color-text);
    transition: var(--transition);
}

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

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

/* ==========================================================================
   Cards / Surfaces
   ========================================================================== */

.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-5);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.badge-accent {
    background: var(--color-accent-light);
    color: var(--color-accent-hover);
}

.section-kicker {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--color-accent-hover);
    text-transform: uppercase;
}

.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-5) 0;
}

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

.alert {
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: var(--space-4);
}

.alert-error {
    background: var(--color-error-light);
    color: var(--color-error);
}

.alert-success {
    background: var(--color-success-light);
    color: var(--color-success);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}