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

:root {
    --bg:            #f3f0eb;
    --surface:       #fafaf7;
    --surface-alt:   #f7f4f0;
    --input-bg:      #fdfcfb;
    --text:          #1a1a1a;
    --text-secondary:#6b6560;
    --text-muted:    #9e9790;
    --border:        #e5e0d6;
    --border-focus:  #4f46e5;
    --primary:       #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --success:       #059669;
    --success-bg:    #ecfdf5;
    --danger:        #dc2626;
    --radius:        12px;
    --radius-sm:     8px;
    --shadow-sm:     0 1px 2px rgba(26,26,26,0.04);
    --shadow:        0 1px 3px rgba(26,26,26,0.06), 0 1px 2px rgba(26,26,26,0.04);
    --shadow-lg:     0 4px 16px rgba(26,26,26,0.08), 0 2px 4px rgba(26,26,26,0.04);
    --font:          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono:     "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Menlo, Courier, monospace;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ===== HEADER ===== */
.header {
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}
.header-inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
}
.logo:hover {
    color: var(--text);
}
.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

/* ===== MAIN ===== */
.main {
    flex: 1;
    max-width: 760px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px 48px;
}

/* ===== HERO ===== */
.hero {
    text-align: center;
    margin-bottom: 28px;
}
.hero-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.25;
    color: var(--text);
}
.hero-highlight {
    color: var(--primary);
}
.hero-sub {
    margin-top: 8px;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* ===== CARD ===== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* ===== CREATE CARD ===== */
.create-card {
    padding: 28px;
}

/* ===== TEXTAREA ===== */
.textarea-wrapper {
    position: relative;
}
.content-input {
    width: 100%;
    min-height: 220px;
    padding: 16px 18px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text);
    background: var(--input-bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    resize: vertical;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.content-input::placeholder {
    color: var(--text-muted);
}
.content-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
}

.textarea-footer {
    display: flex;
    justify-content: flex-end;
    padding: 6px 4px 0;
}
.char-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}
.char-count.warn {
    color: var(--danger);
}

/* ===== FORM ACTIONS ===== */
.form-actions {
    margin-top: 16px;
    display: flex;
    justify-content: flex-end;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 20px;
    font-family: var(--font);
    font-size: 0.92rem;
    font-weight: 600;
    border: 1.5px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    text-decoration: none;
}
.btn:active {
    transform: scale(0.98);
}
.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--primary);
    color: #fafaf7;
    border-color: var(--primary);
}
.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}
.btn-secondary:hover {
    background: var(--surface-alt);
    border-color: var(--text-muted);
}

.btn-copy {
    background: var(--success-bg);
    color: var(--success);
    border-color: var(--success);
    padding: 8px 16px;
    font-size: 0.85rem;
}
.btn-copy:hover {
    background: #d1fae5;
}

.btn-copy-sm {
    padding: 5px 12px;
    font-size: 0.8rem;
    gap: 5px;
}

/* ===== RESULT BOX ===== */
.result-box {
    margin-top: 20px;
    padding: 18px 20px;
    background: var(--success-bg);
    border: 1.5px solid #a7f3d0;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.result-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--success);
    font-size: 0.92rem;
}
.result-link-row {
    display: flex;
    gap: 8px;
    align-items: center;
}
.result-url {
    flex: 1;
    padding: 9px 14px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text);
    background: var(--input-bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    user-select: all;
}

/* ===== NOTE PAGE ===== */
.note-page .main {
    max-width: 820px;
}
.note-card {
    padding: 28px 30px;
}
.note-text {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--text);
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
}
.inline-link {
    color: #3b82f6;
    text-decoration: underline;
    text-underline-offset: 2px;
    word-break: break-all;
}
.inline-link:hover {
    color: #2563eb;
}

/* ===== LINK PREVIEW ===== */
.link-preview {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 18px 20px;
    background: var(--primary-light);
    border: 1.5px solid #c7d2fe;
    border-radius: var(--radius-sm);
}
.link-icon {
    flex-shrink: 0;
    margin-top: 1px;
}
.link-url {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.92rem;
    color: var(--primary);
    word-break: break-all;
    text-decoration: underline;
    text-underline-offset: 3px;
}
.link-url:hover {
    color: var(--primary-hover);
}
.external-icon {
    flex-shrink: 0;
    margin-top: 3px;
    opacity: 0.6;
}

/* ===== NOTE META ===== */
.note-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}
.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* ===== EXTERNAL LINK REDIRECT PAGE ===== */
.go-page .main {
    max-width: 640px;
}
.go-card {
    padding: 36px 32px;
    text-align: center;
}
.go-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}
.go-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}
.go-desc {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 20px;
    line-height: 1.55;
}
.go-url-box {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--input-bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
    max-width: 100%;
}
.go-url-text {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    word-break: break-all;
    text-align: left;
}
a.go-url-text {
    color: #3b82f6;
    text-decoration: underline;
    text-underline-offset: 2px;
}
a.go-url-text:hover {
    color: #2563eb;
}
.go-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* ===== NOTE 404 ===== */
.note-404 {
    text-align: center;
    padding: 48px 30px;
}
.note-404-icon {
    margin-bottom: 16px;
    display: flex;
    justify-content: center;
}
.note-404 h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}
.note-404 p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* ===== CREATE ANOTHER ===== */
.create-another {
    text-align: center;
    margin-top: 24px;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 20px 24px;
    color: var(--text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

/* ===== SPINNER ===== */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(250,250,247,0.3);
    border-top-color: #fafaf7;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
    .hero-title {
        font-size: 1.4rem;
    }
    .hero-sub {
        font-size: 0.95rem;
    }
    .main {
        padding: 20px 14px 32px;
    }
    .create-card {
        padding: 18px 16px;
    }
    .note-card {
        padding: 20px 16px;
    }
    .content-input {
        min-height: 180px;
        font-size: 0.88rem;
    }
    .result-link-row {
        flex-direction: column;
    }
    .result-link-row .btn {
        width: 100%;
        justify-content: center;
    }
    .note-meta {
        gap: 12px;
    }
    .header-inner {
        padding: 12px 16px;
    }
}