/* =============================================
   StemDja Short Link - Stylesheet Utama
   Mobile-first & responsive
   ============================================= */

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --bg: #f4f5fb;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --success: #16a34a;
    --error: #dc2626;
    --radius: 14px;
    --shadow: 0 10px 30px -10px rgba(79, 70, 229, 0.25);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
    background: linear-gradient(135deg, #eef2ff 0%, #f4f5fb 60%, #eafff5 100%);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.site-header {
    padding: 20px 16px;
    text-align: center;
}

.site-header .logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.site-header .logo span {
    color: var(--text);
}

.site-header p {
    margin: 6px 0 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ===== Main container ===== */
.main-content {
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 16px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px 24px;
    width: 100%;
    max-width: 560px;
    margin-top: 12px;
}

.card h1 {
    font-size: 1.4rem;
    margin: 0 0 6px;
}

.card .subtitle {
    color: var(--text-muted);
    margin: 0 0 20px;
    font-size: 0.92rem;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.88rem;
    margin-bottom: 6px;
    color: var(--text);
}

.form-group .hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

input[type="text"],
input[type="url"],
input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 0.95rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    outline: none;
}

input[type="text"]:focus,
input[type="url"]:focus,
input[type="password"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.alias-group {
    display: flex;
    align-items: stretch;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.alias-group:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.alias-group .prefix {
    background: #f3f4f6;
    color: var(--text-muted);
    padding: 12px 10px;
    font-size: 0.85rem;
    white-space: nowrap;
    display: flex;
    align-items: center;
    border-right: 1.5px solid var(--border);
}

.alias-group input {
    border: none;
    border-radius: 0;
    flex: 1;
    min-width: 0;
}

.alias-group input:focus {
    box-shadow: none;
}

/* ===== Button ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 13px 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.05s ease;
}

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

.btn:active {
    transform: scale(0.99);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: #fff;
    color: var(--primary);
    border: 1.5px solid var(--primary);
}

.btn-secondary:hover {
    background: #eef2ff;
}

.btn-sm {
    width: auto;
    padding: 8px 14px;
    font-size: 0.85rem;
}

.btn-danger {
    background: var(--error);
}

.btn-danger:hover {
    background: #b91c1c;
}

/* ===== Result box ===== */
#result {
    margin-top: 20px;
}

.result-box {
    display: none;
    background: #f0fdf4;
    border: 1.5px solid #bbf7d0;
    border-radius: 10px;
    padding: 16px;
    animation: fadeIn 0.25s ease;
}

.result-box.show {
    display: block;
}

.result-box.error {
    background: #fef2f2;
    border-color: #fecaca;
}

.result-box .result-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.result-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.result-row input {
    flex: 1;
    font-weight: 600;
    color: var(--primary-dark);
    background: #fff;
}

.error-text {
    color: var(--error);
    font-size: 0.9rem;
    margin: 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Footer ===== */
.site-footer {
    text-align: center;
    padding: 18px 16px;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.site-footer a {
    color: var(--primary);
    text-decoration: none;
}

/* ===== Error pages ===== */
.error-page {
    text-align: center;
}

.error-page .code {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary);
    margin: 0;
    line-height: 1;
}

.error-page h2 {
    margin: 8px 0 6px;
}

.error-page p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* ===== Responsive tweaks ===== */
@media (min-width: 640px) {
    .card {
        padding: 36px 40px;
    }

    .card h1 {
        font-size: 1.7rem;
    }
}

@media (max-width: 380px) {
    .alias-group {
        flex-direction: column;
    }

    .alias-group .prefix {
        border-right: none;
        border-bottom: 1.5px solid var(--border);
    }
}