:root {
    --color-bg: #161618;
    --font-display: 'Source Sans 3', 'Source Sans Pro', 'Noto Sans KR', sans-serif;
    --font-body: 'Source Sans 3', 'Source Sans Pro', 'Noto Sans KR', 'Inter', sans-serif;
    
    --bg-dark: var(--color-bg);
    --panel-bg: rgba(17, 24, 39, 0.65);
    --panel-border: rgba(255, 255, 255, 0.1);
    --primary: #e2e8f0;
    --primary-glow: rgba(226, 232, 240, 0.4);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --input-bg: rgba(255, 255, 255, 0.05);
    --input-border: rgba(255, 255, 255, 0.15);
    --input-focus: #e2e8f0;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

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

.tagline {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.5;
    font-weight: 300;
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    position: relative;
    overflow: hidden;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

/* Steps */
.step-view {
    display: none;
    flex-direction: column;
    animation: fadeIn 0.4s ease-out forwards;
    height: 100%;
}

.step-view.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.step-header {
    margin-bottom: 2rem;
    text-align: center;
}

.step-badge {
    display: inline-block;
    background: rgba(226, 232, 240, 0.1);
    color: var(--primary);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

.step-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Inputs */
.input-group {
    position: relative;
    margin-bottom: 2rem;
}

.input-group i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.2rem;
}

.input-group input {
    width: 100%;
    padding: 1.2rem 1rem 1.2rem 3rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 12px;
    color: var(--text-main);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(226, 232, 240, 0.15);
    background: rgba(255, 255, 255, 0.08);
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-main);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

.form-group select option {
    background-color: var(--bg-dark);
    color: var(--text-main);
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--input-focus);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 1.2rem;
    background: var(--primary);
    color: #000;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--primary-glow);
    font-family: inherit;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
    background: #ffffff;
}

.btn-secondary {
    padding: 1.2rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border: 1px solid var(--input-border);
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 0 0 30%;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-outline {
    margin-top: 1.5rem;
    padding: 1rem 2rem;
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--input-border);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

/* Loading State */
#step-loading {
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 300px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(226, 232, 240, 0.2);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1.5rem;
}

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

/* Results Display */
.register-result {
    background: rgba(0, 0, 0, 0.4);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--panel-border);
}

.result-header {
    text-align: center;
    margin-bottom: 1.2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.result-header i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
    display: inline-block;
    filter: drop-shadow(0 0 8px var(--primary-glow));
}

.result-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.2rem;
}

.result-header p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
}

.grid-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    transition: all 0.2s ease;
}

.grid-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(226, 232, 240, 0.2);
}

.grid-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grid-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
}

.grid-value.highlight {
    color: var(--primary);
    text-shadow: 0 0 10px rgba(226, 232, 240, 0.2);
}

.grid-value.highlight-blue {
    color: #3b82f6;
    text-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

@media (max-width: 480px) {
    .result-grid {
        grid-template-columns: 1fr;
    }
}

/* Success View */
.success {
    text-align: center;
    align-items: center;
    justify-content: center;
    min-height: 350px;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: rgba(226, 232, 240, 0.15);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 2.5rem;
    box-shadow: 0 0 30px var(--primary-glow);
}

.success h2 {
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.success p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.receipt-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    width: 100%;
}

.receipt-box p {
    margin: 0;
    color: var(--text-main);
}

.receipt-box strong {
    color: var(--primary);
    font-family: var(--font-display);
    letter-spacing: 1px;
}

/* Toast SMS Notification */
.sms-toast {
    position: fixed;
    top: 20px;
    right: -400px; /* Hidden initially */
    width: 350px;
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.1);
    padding: 1.2rem;
    z-index: 1000;
    transition: right 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.sms-toast.show {
    right: 20px;
}

.sms-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
}

.sms-header i {
    color: #3b82f6;
}

.sms-header span {
    font-weight: 600;
    flex-grow: 1;
}

.sms-header small {
    color: var(--text-muted);
}

.sms-body {
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    padding: 1rem;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-main);
}

@media (max-width: 600px) {
    .container {
        padding: 1rem 0.5rem;
    }
    .glass-panel {
        padding: 1.5rem 1.2rem;
        border-radius: 16px;
    }
    .action-buttons {
        flex-direction: column;
        gap: 0.8rem;
    }
    .btn-secondary {
        order: 2;
    }
    .btn-primary {
        order: 1;
    }
    .btn-primary, .btn-secondary {
        width: 100% !important;
        flex: none !important;
        padding: 1rem !important;
        font-size: 1rem !important;
    }
    .sms-toast {
        width: calc(100% - 40px);
        right: auto;
        left: 50%;
        transform: translateX(-50%);
        top: -200px;
        transition: top 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    }
    .sms-toast.show {
        top: 20px;
        right: auto;
    }
    
    /* Daum Postcode Modal responsive adjustment */
    #postcode-modal > div {
        width: 95% !important;
        padding: 1rem !important;
        max-height: 90vh;
        overflow-y: auto;
    }
    #postcode-layer {
        height: 320px !important;
    }
}

/* Service Card Choice Grid */
.service-card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
    width: 100%;
}

.service-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 0.9rem 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.service-card i {
    font-size: 1.3rem;
    color: var(--text-muted);
    transition: all 0.3s ease;
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.service-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.service-info h5 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
    transition: all 0.3s ease;
}

.service-info p {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.35;
    margin: 0;
}

.service-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(226, 232, 240, 0.25);
    transform: translateY(-1px);
}

.service-card:hover i {
    color: var(--primary);
    background: rgba(226, 232, 240, 0.1);
}

/* Service Card Selected State */
.service-card.selected {
    background: rgba(226, 232, 240, 0.06);
    border-color: var(--primary) !important;
    box-shadow: 0 0 15px rgba(226, 232, 240, 0.15);
}

.service-card.selected i {
    color: #161618 !important;
    background: var(--primary) !important;
    border-color: var(--primary) !important;
}

.service-card.selected h5 {
    color: var(--primary) !important;
    font-weight: 700;
}

@media (max-width: 480px) {
    .service-card-grid {
        grid-template-columns: 1fr;
    }
    .glass-panel {
        padding: 1.5rem;
    }
    .container {
        padding: 1rem;
    }
    .logo {
        font-size: 2rem;
    }
}

/* Success Screen Contact Buttons Hover Effects */
.contact-btn {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.phone-btn:hover {
    background: rgba(255, 255, 255, 0.12) !important;
    border-color: rgba(255, 255, 255, 0.25) !important;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.08);
}

.kakao-btn:hover {
    background: #fdd100 !important;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(254, 229, 0, 0.25);
}