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

:root {
    --primary: #5B7FFF;
    --primary-dark: #4263EB;
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-500: #6B7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --radius-sm: 12px;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--gray-900);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app {
    min-height: 100vh;
    min-height: 100dvh;
}

/* Screen States */
.screen {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

/* Loading Screen */
.loading-screen {
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
}

.loading-content {
    text-align: center;
    color: var(--white);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 1rem;
    opacity: 0.9;
}

/* Permission Screen */
.permission-screen {
    justify-content: center;
    align-items: center;
    padding: 24px;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
}

.permission-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    max-width: 400px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.permission-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.permission-content h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.permission-content > p {
    font-size: 0.938rem;
    color: var(--gray-500);
    margin-bottom: 24px;
}

.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    padding: 12px 20px;
    background: var(--gray-100);
    color: var(--gray-700);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.938rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.manual-search {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

.manual-search > p {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 12px;
}

#manual-search-form {
    display: flex;
    gap: 8px;
}

#manual-city {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 0.938rem;
    outline: none;
    transition: border-color 0.2s;
}

#manual-city:focus {
    border-color: var(--primary);
}

/* Error Screen */
.error-screen {
    justify-content: center;
    align-items: center;
    padding: 24px;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
}

.error-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    max-width: 400px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.error-content p {
    font-size: 1rem;
    color: var(--gray-700);
    margin-bottom: 24px;
}

/* Main Screen */
.main-screen {
    background: var(--gray-50);
}

.header {
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--white);
    padding: 16px 20px;
    text-align: center;
}

.location-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-bottom: 4px;
}

.location-icon {
    font-size: 1rem;
}

#location-name {
    font-size: 1.125rem;
    font-weight: 600;
}

.refresh-btn {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    padding: 4px;
    opacity: 0.8;
    transition: opacity 0.2s, transform 0.2s;
}

.refresh-btn:hover {
    opacity: 1;
}

.refresh-btn:active {
    transform: rotate(180deg);
}

.update-time {
    font-size: 0.75rem;
    opacity: 0.8;
}

.main-content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Weather Card */
.weather-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
}

.current-weather {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.weather-icon {
    font-size: 4rem;
    line-height: 1;
}

.temp-wrap {
    display: flex;
    align-items: flex-start;
}

.current-temp {
    font-size: 4rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1;
}

.temp-unit {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-top: 8px;
}

.weather-desc {
    font-size: 1.125rem;
    color: var(--gray-500);
    margin-bottom: 20px;
    text-transform: capitalize;
}

.weather-details {
    display: flex;
    justify-content: space-around;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

.detail-item {
    text-align: center;
}

.detail-label {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: 4px;
}

.detail-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
}

/* Outfit Section */
.outfit-section {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.section-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
    text-align: center;
}

.outfit-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.outfit-item {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: 16px 8px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.outfit-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.outfit-item .icon {
    font-size: 2rem;
    margin-bottom: 8px;
    display: block;
}

.outfit-item .label {
    font-size: 0.813rem;
    color: var(--gray-700);
    font-weight: 500;
    word-break: keep-all;
}

.outfit-tip {
    background: linear-gradient(135deg, rgba(91, 127, 255, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: var(--radius-sm);
    padding: 16px;
    border-left: 4px solid var(--primary);
}

.outfit-tip h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 6px;
}

.outfit-tip p {
    font-size: 0.875rem;
    color: var(--gray-700);
    line-height: 1.6;
}

/* Footer */
.footer {
    padding: 16px;
    text-align: center;
    background: var(--gray-100);
}

.footer p {
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* ========================================
   TABLET (768px and up)
   ======================================== */
@media (min-width: 768px) {
    html {
        font-size: 17px;
    }

    .permission-content,
    .error-content {
        padding: 40px 32px;
        max-width: 480px;
    }

    .header {
        padding: 24px 32px;
    }

    #location-name {
        font-size: 1.375rem;
    }

    .main-content {
        padding: 32px;
        max-width: 720px;
        margin: 0 auto;
        gap: 24px;
    }

    .weather-card {
        padding: 32px;
    }

    .weather-icon {
        font-size: 5rem;
    }

    .current-temp {
        font-size: 5rem;
    }

    .temp-unit {
        font-size: 2rem;
    }

    .weather-details {
        max-width: 400px;
        margin: 0 auto;
        padding-top: 24px;
    }

    .detail-label {
        font-size: 0.813rem;
    }

    .detail-value {
        font-size: 1.125rem;
    }

    .outfit-section {
        padding: 32px;
    }

    .section-title {
        font-size: 1.25rem;
        margin-bottom: 24px;
    }

    .outfit-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 16px;
    }

    .outfit-item {
        padding: 20px 12px;
    }

    .outfit-item .icon {
        font-size: 2.5rem;
    }

    .outfit-item .label {
        font-size: 0.875rem;
    }

    .outfit-tip {
        padding: 20px;
    }
}

/* ========================================
   DESKTOP (1024px and up)
   ======================================== */
@media (min-width: 1024px) {
    html {
        font-size: 18px;
    }

    .main-content {
        max-width: 900px;
        padding: 40px;
        gap: 32px;
        flex-direction: row;
        align-items: flex-start;
    }

    .weather-card {
        flex: 1;
        min-width: 340px;
        padding: 40px;
    }

    .weather-icon {
        font-size: 5.5rem;
    }

    .current-temp {
        font-size: 5.5rem;
    }

    .outfit-section {
        flex: 1.2;
        padding: 40px;
    }

    .outfit-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .outfit-item {
        padding: 24px 16px;
    }

    .outfit-item .icon {
        font-size: 2.75rem;
        margin-bottom: 12px;
    }

    .outfit-item .label {
        font-size: 0.938rem;
    }
}

/* ========================================
   LARGE DESKTOP (1440px and up)
   ======================================== */
@media (min-width: 1440px) {
    .main-content {
        max-width: 1100px;
    }

    .weather-card {
        min-width: 400px;
    }

    .outfit-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Safe area for notched devices */
@supports (padding: max(0px)) {
    .header {
        padding-top: max(16px, env(safe-area-inset-top));
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
    }

    .main-content {
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
    }

    .footer {
        padding-bottom: max(16px, env(safe-area-inset-bottom));
    }
}