:root {
    --bg-gradient: linear-gradient(135deg, #F3F4F6 0%, #E5E7EB 100%);
    --card-bg: rgba(255, 255, 255, 0.88);
    --card-border: rgba(255, 255, 255, 0.6);
    --text-main: #111827;
    --text-sub: #4B5563;
    --accent-primary: #4F46E5; /* Modern Indigo */
    --accent-gradient: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
    --gold-gradient: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
    --shadow-modern: 0 20px 50px rgba(0, 0, 0, 0.08);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-pill: 9999px;
}

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

body {
    font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Inter", sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 35px 18px;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 580px;
}

header {
    text-align: center;
    margin-bottom: 32px;
}

header h1 {
    font-size: 2.3rem;
    font-weight: 900;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, #1F2937 0%, #4F46E5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

header p {
    font-size: 1.05rem;
    color: var(--text-sub);
    font-weight: 500;
    word-break: keep-all;
    text-wrap: balance;
}

/* Glassmorphism Card */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-modern);
    padding: 42px 32px;
    border: 1px solid var(--card-border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hidden {
    display: none !important;
}

/* Modern Dropzone */
.upload-area {
    border: 2px dashed rgba(79, 70, 229, 0.35);
    border-radius: var(--radius-lg);
    padding: 42px 20px;
    text-align: center;
    cursor: pointer;
    background: rgba(249, 250, 251, 0.6);
    transition: all 0.25s ease;
    margin-bottom: 26px;
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    background: rgba(238, 242, 255, 0.6);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.upload-area span {
    display: block;
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 1.05rem;
}

.upload-area img {
    max-width: 100%;
    max-height: 280px;
    border-radius: 14px;
    margin: 0 auto;
    display: none;
    object-fit: contain;
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

/* Form */
.form-group {
    margin-bottom: 30px;
}

.form-group label {
    display: block;
    font-weight: 800;
    font-size: 1.05rem;
    margin-bottom: 10px;
    color: var(--text-main);
    letter-spacing: -0.01em;
}

.form-group textarea {
    width: 100%;
    height: 120px;
    padding: 16px;
    border: 1.5px solid rgba(0,0,0,0.12);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    background: #FFFFFF;
    transition: all 0.2s ease;
    color: var(--text-main);
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
}

/* Modern Buttons */
.btn-primary {
    width: 100%;
    padding: 18px;
    background: var(--accent-gradient);
    color: #FFFFFF;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 1.1rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 12px 25px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    width: 100%;
    padding: 18px;
    background: var(--gold-gradient);
    color: #FFFFFF;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 1.1rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 12px 25px rgba(245, 158, 11, 0.4);
}

/* Modern Certificate Card */
.certificate {
    background: #FFFFFF;
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 24px;
    padding: 36px 24px;
    text-align: center;
    box-shadow: 0 10px 35px rgba(0,0,0,0.05);
    position: relative;
    margin-bottom: 30px;
    background-image: radial-gradient(#E5E7EB 1px, transparent 1px);
    background-size: 20px 20px;
}

.cert-title {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 14px;
}

.cert-name {
    font-size: 1.65rem;
    font-weight: 900;
    color: var(--text-main);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    word-break: keep-all;
    text-wrap: balance;
}

.cert-value {
    font-size: 1.3rem;
    font-weight: 800;
    color: #EC4899;
    background: #FDF2F8;
    padding: 10px 22px;
    border-radius: var(--radius-pill);
    display: inline-block;
    margin-bottom: 22px;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.15);
}

.cert-comment {
    font-size: 1.05rem;
    color: var(--text-sub);
    line-height: 1.7;
    word-break: keep-all;
    text-wrap: balance;
}

/* Premium Memoir Box */
.memoir-box {
    background: #F8FAFC;
    border-radius: 20px;
    padding: 28px 24px;
    font-size: 1.05rem;
    line-height: 1.85;
    color: #334155;
    border: 1px solid rgba(0,0,0,0.06);
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.02);
    text-align: justify;
    word-break: keep-all;
}

/* Spinner */
.spinner {
    border: 3px solid rgba(0, 0, 0, 0.08);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Coupang iframe strict containment */
#coupang-appraise-slot, #coupang-gate-slot {
    width: 100% !important;
    max-width: 100% !important;
    overflow: hidden !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    margin: 0 auto !important;
    position: relative !important;
}

#coupang-appraise-slot iframe, #coupang-gate-slot iframe,
#coupang-appraise-slot div, #coupang-gate-slot div {
    max-width: 100% !important;
    margin: 0 auto !important;
    display: block !important;
    float: none !important;
}

@media (max-width: 600px) {
    body { padding: 20px 12px; }
    .card { padding: 30px 20px; border-radius: 22px; }
    header h1 { font-size: 1.9rem; }
    .cert-name { font-size: 1.4rem; }
    .memoir-box { font-size: 0.98rem; padding: 22px 18px; }
}