/* ===================================
   공공친구 - 비밀번호 찾기 페이지
   Design System v2.0 (Light Theme)
   =================================== */

/* ========================================
   CSS 변수 (Design System)
   ======================================== */
:root {
    /* Colors */
    --primary: #3C8D99;
    --secondary: #6FCCB4;
    --accent: #FFB347;
    --danger: #EF4444;
    --success: #10B981;
    --warning: #F59E0B;
    --info: #3B82F6;
    
    /* Grays */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Layout */
    --background: #F8FAFC;
    --surface: #FFFFFF;
    --border: #E5E7EB;
    
    /* Text */
    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --text-light: #F9FAFB;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-hover: #f3f4f6;
    
    /* Semantic Backgrounds */
    --success-bg: rgba(16, 185, 129, 0.1);
    --success-light: #D1FAE5;
    --error-bg: rgba(239, 68, 68, 0.1);
    --error-light: #FEE2E2;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --warning-light: #FEF3C7;
    --primary-bg: rgba(60, 141, 153, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 40px rgba(60, 141, 153, 0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Pretendard Variable', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========================================
   배경 효과
   ======================================== */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(60, 141, 153, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(111, 204, 180, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(255, 179, 71, 0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(60, 141, 153, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(60, 141, 153, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ========================================
   헤더
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.back-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.back-button:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    color: var(--primary);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-primary);
}

.header-logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, #2d6b73 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(60, 141, 153, 0.25);
}

.header-logo-icon svg {
    width: 24px;
    height: 24px;
}

.header-logo-text {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

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

.header-spacer {
    width: 40px;
}

/* ========================================
   메인 컨테이너
   ======================================== */
.main-container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 100px var(--spacing-md) var(--spacing-xl);
}

/* ========================================
   폼 카드
   ======================================== */
.form-card {
    width: 100%;
    max-width: 480px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ========================================
   페이지 전환
   ======================================== */
.page {
    display: none;
    animation: fadeIn 0.4s ease;
}

.page.active {
    display: block;
}

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

/* ========================================
   페이지 헤더
   ======================================== */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-lg);
    background: var(--primary-bg);
    border: 1px solid rgba(60, 141, 153, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.page-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.page-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   폼 스타일
   ======================================== */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-600);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 16px;
    color: var(--gray-400);
    pointer-events: none;
    transition: color var(--transition-normal);
}

.form-input {
    width: 100%;
    height: 56px;
    padding: 0 16px 0 52px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 16px;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 3px rgba(60, 141, 153, 0.15);
}

.form-input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
    color: var(--primary);
}

/* ========================================
   비밀번호 토글
   ======================================== */
.password-toggle {
    position: absolute;
    right: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    transition: color var(--transition-normal);
}

.password-toggle:hover {
    color: var(--gray-600);
}

.form-input[type="password"] ~ .password-toggle .eye-open { display: block; }
.form-input[type="password"] ~ .password-toggle .eye-closed { display: none; }
.form-input[type="text"] ~ .password-toggle .eye-open { display: none; }
.form-input[type="text"] ~ .password-toggle .eye-closed { display: block; }

/* ========================================
   비밀번호 강도
   ======================================== */
.password-strength {
    height: 4px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--spacing-xs);
}

.password-strength-bar {
    height: 100%;
    width: 0;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.password-strength-bar.weak {
    width: 33%;
    background: var(--danger);
}

.password-strength-bar.medium {
    width: 66%;
    background: var(--warning);
}

.password-strength-bar.strong {
    width: 100%;
    background: var(--success);
}

.password-strength-text {
    font-size: 12px;
    font-weight: 500;
    text-align: right;
    margin-top: var(--spacing-xs);
    min-height: 18px;
}

.password-strength-text.weak {
    color: var(--danger);
}

.password-strength-text.medium {
    color: var(--warning);
}

.password-strength-text.strong {
    color: var(--success);
}

/* ========================================
   인증번호 입력
   ======================================== */
.verification-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.verification-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.timer {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.timer.warning {
    color: var(--danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.resend-button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.resend-button:hover {
    background: var(--primary-bg);
    border-color: var(--primary);
}

.verification-code {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.digit-input {
    width: 100%;
    height: 60px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    transition: all var(--transition-normal);
}

.digit-input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 3px rgba(60, 141, 153, 0.15);
}

.digit-input.filled {
    border-color: var(--primary);
    background: var(--primary-bg);
}

/* ========================================
   에러 메시지
   ======================================== */
.error-message {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--danger);
}

.error-message.show {
    display: flex;
}

.error-message svg {
    flex-shrink: 0;
}

/* ========================================
   버튼 그룹
   ======================================== */
.button-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    height: 56px;
    padding: 0 var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    border: none;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #2d6b73 100%);
    color: var(--text-light);
    box-shadow: 0 4px 16px rgba(60, 141, 153, 0.25);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(60, 141, 153, 0.35);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--gray-300);
    color: var(--text-primary);
}

/* ========================================
   결과 페이지
   ======================================== */
.result-container {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.result-icon {
    width: 96px;
    height: 96px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: scaleIn 0.5s ease;
}

.result-icon.success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(16, 185, 129, 0.05) 100%);
    border: 2px solid var(--success);
    color: var(--success);
}

.result-icon.error {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(239, 68, 68, 0.05) 100%);
    border: 2px solid var(--danger);
    color: var(--danger);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.result-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.result-message {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   하단 링크
   ======================================== */
.bottom-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.bottom-link {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.bottom-link:hover {
    color: var(--primary);
}

.link-divider {
    color: var(--gray-300);
}

/* ========================================
   로딩 오버레이
   ======================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(248, 250, 252, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 56px;
    height: 56px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-text {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========================================
   반응형 - 태블릿
   ======================================== */
@media (max-width: 768px) {
    .main-container {
        padding: 80px var(--spacing-md) var(--spacing-lg);
        justify-content: flex-start;
    }
    
    .form-card {
        padding: var(--spacing-lg);
        border-radius: var(--radius-lg);
    }
    
    .page-icon {
        width: 64px;
        height: 64px;
    }
    
    .page-icon svg {
        width: 28px;
        height: 28px;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .digit-input {
        height: 52px;
        font-size: 20px;
    }
}

/* ========================================
   반응형 - 모바일
   ======================================== */
@media (max-width: 480px) {
    .header-container {
        height: 56px;
    }
    
    .header-logo-text {
        font-size: 18px;
    }
    
    .main-container {
        padding: 72px var(--spacing-md) var(--spacing-md);
    }
    
    .form-card {
        padding: var(--spacing-lg) var(--spacing-md);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
    }
    
    .page-header {
        margin-bottom: var(--spacing-lg);
    }
    
    .page-icon {
        width: 56px;
        height: 56px;
        margin-bottom: var(--spacing-md);
    }
    
    .page-icon svg {
        width: 24px;
        height: 24px;
    }
    
    .page-title {
        font-size: 22px;
    }
    
    .page-description {
        font-size: 14px;
    }
    
    .form-input {
        height: 52px;
        font-size: 15px;
    }
    
    .digit-input {
        height: 48px;
        font-size: 18px;
        border-radius: var(--radius-sm);
    }
    
    .verification-code {
        gap: 6px;
    }
    
    .btn {
        height: 52px;
        font-size: 15px;
    }
    
    .verification-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .verification-meta {
        width: 100%;
        justify-content: space-between;
    }
    
    .bottom-links {
        margin-top: var(--spacing-lg);
    }
}

/* ========================================
   반응형 - 아주 작은 화면
   ======================================== */
@media (max-width: 360px) {
    .verification-code {
        gap: 4px;
    }
    
    .digit-input {
        height: 44px;
        font-size: 16px;
    }
    
    .resend-button {
        padding: 6px 10px;
        font-size: 12px;
    }
    
    .timer {
        font-size: 13px;
    }
}

/* ========================================
   접근성 - 포커스 표시
   ======================================== */
.btn:focus-visible,
.back-button:focus-visible,
.resend-button:focus-visible,
.password-toggle:focus-visible,
.bottom-link:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ========================================
   애니메이션 감소 설정
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}