/* 47_start/public/css/style.css */

/* 1. 디자인 시스템 토큰 정의 */
:root {
    /* Light Mode Palette */
    --color-bg: hsl(210, 20%, 98%);
    --color-card-bg: hsl(0, 0%, 100%);
    --color-text: hsl(220, 15%, 15%);
    --color-text-muted: hsl(220, 10%, 50%);
    --color-border: hsl(220, 10%, 90%);
    --color-primary: hsl(220, 80%, 56%);
    --color-primary-hover: hsl(220, 80%, 50%);
    --color-primary-glow: rgba(59, 130, 246, 0.15);
    --color-shadow: rgba(0, 0, 0, 0.03);
    --color-shadow-hover: rgba(0, 0, 0, 0.06);
    --color-success: hsl(140, 70%, 45%);
    
    /* Layout Variables */
    --radius-card: 16px;
    --radius-input: 12px;
    --radius-button: 10px;
    --max-width-content: 480px;
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables (.dark-mode 클래스 또는 prefers-color-scheme 대응) */
@media (prefers-color-scheme: dark) {
    :root:not(.light-mode-forced) {
        --color-bg: hsl(220, 20%, 10%);
        --color-card-bg: hsl(220, 20%, 13%);
        --color-text: hsl(220, 10%, 90%);
        --color-text-muted: hsl(220, 10%, 60%);
        --color-border: hsl(220, 10%, 20%);
        --color-primary: hsl(220, 90%, 65%);
        --color-primary-hover: hsl(220, 90%, 70%);
        --color-primary-glow: rgba(96, 165, 250, 0.25);
        --color-shadow: rgba(0, 0, 0, 0.2);
        --color-shadow-hover: rgba(0, 0, 0, 0.3);
    }
}

body.dark-mode {
    --color-bg: hsl(220, 20%, 10%);
    --color-card-bg: hsl(220, 20%, 13%);
    --color-text: hsl(220, 10%, 90%);
    --color-text-muted: hsl(220, 10%, 60%);
    --color-border: hsl(220, 10%, 20%);
    --color-primary: hsl(220, 90%, 65%);
    --color-primary-hover: hsl(220, 90%, 70%);
    --color-primary-glow: rgba(96, 165, 250, 0.25);
    --color-shadow: rgba(0, 0, 0, 0.2);
    --color-shadow-hover: rgba(0, 0, 0, 0.3);
}

/* 2. 글로벌 스타일 초기화 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans KR", sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    transition: var(--transition-normal);
}

/* 3. 레이아웃 & 컨테이너 */
.container {
    width: 100%;
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 40px;
    box-shadow: 0 10px 30px var(--color-shadow);
    transition: var(--transition-normal);
}

.card:hover {
    box-shadow: 0 15px 35px var(--color-shadow-hover);
}

/* 4. 타이포그래피 */
.header {
    text-align: center;
    margin-bottom: 32px;
}

.logo-text {
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
    color: var(--color-text);
}

.subtitle {
    font-size: 0.88rem;
    color: var(--color-text-muted);
}

/* 5. 폼 양식 컨트롤 */
.form-group {
    margin-bottom: 20px;
    position: relative;
}

.form-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.9rem;
    font-family: inherit;
    color: var(--color-text);
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-input);
    outline: none;
    transition: var(--transition-fast);
}

.form-control::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-glow);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 16px;
    padding-right: 40px;
}

/* 6. 버튼 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 14px;
    font-size: 0.95rem;
    font-weight: 700;
    font-family: inherit;
    color: #ffffff;
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-button);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

.btn:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

/* 7. 테마 토글 */
.theme-toggle {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* 라이트 모드일 때 보일 다크 모드 아이콘, 다크 모드일 때 보일 라이트 모드 아이콘 제어 */
.theme-toggle .sun-icon {
    display: none;
}
.theme-toggle .moon-icon {
    display: block;
}

body.dark-mode .theme-toggle .sun-icon {
    display: block;
}
body.dark-mode .theme-toggle .moon-icon {
    display: none;
}

@media (prefers-color-scheme: dark) {
    :root:not(.light-mode-forced) .theme-toggle .sun-icon {
        display: block;
    }
    :root:not(.light-mode-forced) .theme-toggle .moon-icon {
        display: none;
    }
}

/* 8. 토스트(Toast) 메시지 스타일 */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--color-text);
    color: var(--color-card-bg);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
    pointer-events: none;
    white-space: nowrap;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* 성공 완료 카드 화면 */
.success-screen {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px 0;
}

.success-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.success-icon svg {
    width: 32px;
    height: 32px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.success-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.success-desc {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}