/* ==========================================================================
   CSS VARIABLES: TEMA TERANG & TEMA GELAP
   ========================================================================== */
:root {
    /* Palette Terang (Default) */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: rgba(37, 99, 235, 0.1);
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --result-bg: #f1f5f9;
    --input-bg: #ffffff;
    --code-bg: #0f172a;
    --code-text: #e2e8f0;
    --tab-border: #cbd5e1;
    --success: #10b981;
    --error: #ef4444;
    --shadow-color: rgba(0, 0, 0, 0.06);
    --transition-speed: 0.25s;
}

[data-theme="dark"] {
    /* Palette Gelap */
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-light: rgba(59, 130, 246, 0.15);
    --bg-main: #0b0f19;
    --card-bg: #131b2e;
    --card-border: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --result-bg: #0d1424;
    --input-bg: #090d16;
    --code-bg: #050811;
    --code-text: #cbd5e1;
    --tab-border: #334155;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   RESET & DASAR TAMPILAN
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color var(--transition-speed) ease, 
                border-color var(--transition-speed) ease, 
                color var(--transition-speed) ease;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 820px;
    margin: 0 auto;
}

/* ==========================================================================
   NAVIGASI ATAS (TOMBOL KEMBALI & TOGGLE MODE)
   ========================================================================== */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0 25px 0;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 16px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.btn-back:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateX(-2px);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    color: var(--text-main);
    cursor: pointer;
    box-shadow: 0 2px 4px var(--shadow-color);
}

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

/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
    text-align: center;
    margin: 15px 0 35px 0;
}

.logo-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 12px;
}

.logo-area .icon {
    font-size: 2.75rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.header h1 span {
    color: var(--primary);
}

.header p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 650px;
    margin: 0 auto;
}

/* ==========================================================================
   KARTU APLIKASI (CONVERTER)
   ========================================================================== */
.shadow {
    box-shadow: 0 10px 25px -5px var(--shadow-color), 0 8px 10px -6px var(--shadow-color);
}

.app-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    margin-bottom: 35px;
    border: 1px solid var(--card-border);
}

/* Switcher Server Endpoint */
.api-switch-group {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.api-select {
    background-color: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--card-border);
    padding: 6px 12px;
    border-radius: 6px;
    outline: none;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
}

.api-select:focus {
    border-color: var(--primary);
}

/* Input Group */
.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 25px;
}

.input-group label {
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 1.05rem;
}

.input-group input {
    font-family: 'Inter', sans-serif;
    font-size: 1.65rem;
    padding: 16px 20px;
    border: 2px solid var(--card-border);
    border-radius: 10px;
    outline: none;
    font-weight: 700;
    background-color: var(--input-bg);
    color: var(--text-main);
}

.input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.hint {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Kotak Tampilan Hasil */
.result-box {
    background-color: var(--result-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 24px;
    position: relative;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.75px;
}

.btn-copy {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-main);
}

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

.btn-copy:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.result-text {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    min-height: 85px;
    display: flex;
    align-items: center;
    line-height: 1.35;
    word-break: break-word;
}

.placeholder-text {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 1.2rem;
    opacity: 0.6;
}

.error-text {
    color: var(--error);
    font-size: 1.15rem;
}

.hidden {
    display: none !important;
}

/* Spinner & Loading */
.loading-indicator {
    position: absolute;
    bottom: 12px;
    right: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.spinner {
    width: 12px;
    height: 12px;
    border: 2px solid var(--primary-light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==========================================================================
   DOKUMENTASI DEVELOPER & KODE
   ========================================================================== */
.docs-section {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--card-border);
    margin-bottom: 30px;
}

.docs-section h2 {
    margin-bottom: 12px;
    font-size: 1.45rem;
    font-weight: 700;
}

.docs-section p {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.endpoint-box {
    background-color: var(--result-bg);
    border: 1px solid var(--card-border);
    padding: 14px 18px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    overflow-x: auto;
}

.method {
    background-color: var(--success);
    color: #ffffff;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

.endpoint-box code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: var(--text-main);
}

.tabs {
    display: flex;
    border-bottom: 2px solid var(--tab-border);
    margin-bottom: -1px;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: 10px 18px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 20px;
    border-radius: 0 0 10px 10px;
    overflow-x: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.88rem;
    line-height: 1.5;
}

.tab-content pre {
    border-radius: 0 10px 10px 10px;
    margin-bottom: 25px;
}

.docs-section h3 {
    margin: 25px 0 12px;
    font-size: 1.1rem;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    text-align: center;
    padding: 25px 0 40px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ==========================================================================
   RESPONSIF MOBILE
   ========================================================================== */
@media (max-width: 650px) {
    body { padding: 15px; }
    .app-card, .docs-section { padding: 20px; }
    .header h1 { font-size: 2rem; }
    .input-group input { font-size: 1.3rem; padding: 12px; }
    .result-text { font-size: 1.3rem; }
    .api-switch-group { flex-direction: column; align-items: flex-start; }
}