/* ============================================
   Personal Home - 전역 스타일
   ============================================ */

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

:root {
    /* Colors */
    --bg: #fafafa;
    --bg-card: #ffffff;
    --bg-hover: #f5f5f7;
    --text: #1d1d1f;
    --text-sub: #6e6e73;
    --text-muted: #aeaeb2;
    --primary: #0071e3;
    --primary-hover: #0077ed;
    --primary-light: rgba(0,113,227,0.08);
    --success: #34c759;
    --warning: #ff9f0a;
    --error: #ff3b30;
    --border: #e5e5ea;
    --border-light: #f2f2f7;

    /* Layout */
    --nav-height: 60px;
    --content-max: 1200px;
    --radius: 12px;
    --radius-sm: 8px;

    /* Shadow */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

    /* Transition */
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                 'Noto Sans KR', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

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

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

/* ============================================
   Typography
   ============================================ */
h1 { font-size: 2rem; font-weight: 700; line-height: 1.3; }
h2 { font-size: 1.5rem; font-weight: 600; line-height: 1.35; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; }
h4 { font-size: 1.1rem; font-weight: 500; }

/* ============================================
   Utility
   ============================================ */
.container {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 20px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    line-height: 1.4;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-secondary { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { background: var(--bg-hover); }
.btn-danger { background: var(--error); color: #fff; }
.btn-danger:hover:not(:disabled) { opacity: 0.9; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 12px 28px; font-size: 16px; }

/* ============================================
   Forms
   ============================================ */
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}
.form-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin: 4px 0 8px;
    letter-spacing: -0.2px;
    line-height: 1.4;
}
.form-input,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
textarea,
select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    color: var(--text);
    background: var(--bg-card);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}
input:focus, textarea:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* ============================================
   Toast
   ============================================ */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: #fff;
    box-shadow: var(--shadow);
    animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
    max-width: 360px;
}
.toast.success { background: var(--success); }
.toast.warning { background: var(--warning); }
.toast.error { background: var(--error); }
.toast.info { background: var(--primary); }

@keyframes toastIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes toastOut {
    from { opacity: 1; }
    to { opacity: 0; transform: translateY(-10px); }
}

/* ============================================
   Modal Backdrop
   ============================================ */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 5000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}
.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-width: 440px;
    width: 100%;
    padding: 32px;
    position: relative;
    animation: slideUp 0.3s ease;
}
.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-sub);
    cursor: pointer;
    line-height: 1;
}
.modal-close:hover { color: var(--text); }

@keyframes fadeIn {
    from { opacity: 0; } to { opacity: 1; }
}
@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ============================================
   Loading Spinner
   ============================================ */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.page-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    :root {
        --nav-height: 56px;
        --content-max: 100%;
    }
    h1 { font-size: 1.6rem; }
    h2 { font-size: 1.3rem; }
}