/* ===================================================
   Bulk Envelope Generator — UI Styles
   =================================================== */
:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --success: #10B981;
    --success-hover: #059669;
    --danger: #EF4444;
    --danger-hover: #DC2626;
    --bg: #F3F4F6;
    --card: #FFFFFF;
    --text: #1F2937;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary), #7C3AED);
    color: white;
    padding: 24px 20px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(79,70,229,0.3);
}

.app-header h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.app-header p {
    font-size: 14px;
    opacity: 0.85;
    margin-top: 4px;
}

/* Main layout */
main {
    max-width: 680px;
    margin: 24px auto;
    padding: 0 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-bottom: 40px;
}

/* Cards */
.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.card h2 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card h2 .step {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

/* Form elements */
label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

textarea, select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: var(--font);
    font-size: 14px;
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    background: white;
}

textarea:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

textarea {
    resize: vertical;
    min-height: 90px;
}

.form-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    margin-bottom: 14px;
}

.form-row select {
    flex: 1;
}

/* File input */
.file-drop {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 28px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    position: relative;
}

.file-drop:hover,
.file-drop.dragover {
    border-color: var(--primary);
    background: rgba(79,70,229,0.03);
}

.file-drop input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-drop .icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.file-drop .label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.file-drop .hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.file-name {
    margin-top: 10px;
    font-size: 13px;
    color: var(--success);
    font-weight: 600;
    display: none;
}

.file-name.visible {
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-family: var(--font);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
    outline: none;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}

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

.btn-success {
    background: var(--success);
    color: white;
    box-shadow: 0 2px 8px rgba(16,185,129,0.3);
}

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

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

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

.btn-outline {
    background: white;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: var(--bg);
}

.btn-sm {
    padding: 7px 14px;
    font-size: 13px;
}

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

.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-full {
    width: 100%;
}

/* Preview area */
.preview-card {
    display: none;
}

.preview-card.visible {
    display: block;
}

.pdf-frame {
    width: 100%;
    height: 500px;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 16px;
    background: #e5e5e5;
}

/* Status bar */
.status {
    font-size: 13px;
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 14px;
    display: none;
}

.status.visible {
    display: block;
}

.status.success {
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
}

.status.error {
    background: #FEF2F2;
    color: #991B1B;
    border: 1px solid #FECACA;
}

/* Saved address list */
.saved-addr-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.saved-addr-item:last-child {
    border-bottom: none;
}

.saved-addr-text {
    flex: 1;
    cursor: pointer;
    color: var(--primary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.saved-addr-text:hover {
    text-decoration: underline;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 14px 0;
}

/* Responsive */
@media (max-width: 600px) {
    main {
        padding: 0 10px;
    }
    .card {
        padding: 18px;
    }
    .btn-group {
        flex-direction: column;
    }
    .form-row {
        flex-direction: column;
    }
}