:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #131825;
    --accent: #0ea5e9;
    --accent-soft: rgba(14, 165, 233, 0.25);
    --accent-strong: rgba(14, 165, 233, 0.75);
    --surface: rgba(17, 24, 39, 0.75);
    --surface-solid: #111827;
    --text-primary: #f1f5f9;
    --text-secondary: rgba(241, 245, 249, 0.72);
    --success: #10b981;
    --error: #ef4444;
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
    background: radial-gradient(circle at 20% 20%, rgba(14, 165, 233, 0.15), transparent 40%),
        radial-gradient(circle at 80% 0%, rgba(16, 185, 129, 0.12), transparent 45%),
        var(--bg-primary);
    color: var(--text-secondary);
    min-height: 100vh;
    overflow-x: hidden;
}

.background {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.blob {
    position: absolute;
    width: 42vw;
    height: 42vw;
    background: radial-gradient(circle at 30% 30%, rgba(14, 165, 233, 0.22) 0%, rgba(14, 165, 233, 0) 60%);
    filter: blur(0px);
    animation: drift 18s infinite ease-in-out;
}

.blob-one {
    top: -10vw;
    left: -8vw;
}

.blob-two {
    bottom: -12vw;
    right: -6vw;
    animation-delay: 8s;
    background: radial-gradient(circle at 70% 70%, rgba(16, 185, 129, 0.25) 0%, rgba(16, 185, 129, 0) 60%);
}

.orb {
    position: absolute;
    width: 14rem;
    height: 14rem;
    border-radius: 50%;
    opacity: 0.55;
    filter: blur(10px);
    animation: float 14s ease-in-out infinite;
}

.orb-one {
    top: 28vh;
    left: 12vw;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.35), rgba(16, 185, 129, 0.35));
}

.orb-two {
    bottom: 20vh;
    right: 16vw;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.3), rgba(14, 165, 233, 0.35));
    animation-delay: 5s;
}

.topbar {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 8vw;
    backdrop-filter: blur(16px);
    background: linear-gradient(180deg, rgba(10, 14, 26, 0.85), rgba(10, 14, 26, 0.4));
    border-bottom: 1px solid rgba(14, 165, 233, 0.15);
    z-index: 10;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 2rem;
    height: 2rem;
    border-radius: 0.75rem;
    background: linear-gradient(135deg, #0ea5e9, #10b981);
    color: var(--bg-primary);
    font-weight: 700;
}

.brand-text {
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.cta {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    background: rgba(14, 165, 233, 0.18);
    border: 1px solid rgba(14, 165, 233, 0.4);
    padding: 0.6rem 1.4rem;
    border-radius: 999px;
    transition: background 200ms ease, transform 200ms ease;
}

.cta:hover {
    background: rgba(14, 165, 233, 0.3);
    transform: translateY(-2px);
}

main {
    padding: 8vh 8vw 16vh;
}

.hero {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    align-items: center;
    gap: 4rem;
    padding: 6rem 0 8rem;
}

.hero-copy h1 {
    font-size: clamp(2.75rem, 4vw + 1.5rem, 4rem);
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.08;
    text-shadow: 0 12px 38px rgba(0, 0, 0, 0.55);
}

.hero-copy p {
    font-size: 1.08rem;
    max-width: 36ch;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2.2rem;
}

.hero-button {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1.8rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #0ea5e9, #10b981);
    color: #ffffff;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 20px 40px rgba(14, 165, 233, 0.35);
    transition: transform 200ms ease, box-shadow 200ms ease;
}

.hero-button::after {
    content: "";
    display: inline-block;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: 0px 0px 0px 0px rgba(255, 255, 255, 0.7);
    animation: pulse-dot 1400ms infinite;
}

.hero-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 24px 48px rgba(14, 165, 233, 0.4);
}

.hero-visual {
    position: relative;
    min-height: 320px;
    display: grid;
    place-items: center;
}

.pulse {
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: linear-gradient(145deg, rgba(14, 165, 233, 0.25), rgba(16, 185, 129, 0.25));
    filter: blur(12px);
    animation: pulse 3s infinite;
}

.card {
    position: absolute;
    background: rgba(17, 24, 39, 0.55);
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: 1.4rem;
    padding: 1.8rem;
    width: 220px;
    color: var(--text-primary);
    box-shadow: 0 30px 60px rgba(10, 14, 26, 0.35);
    backdrop-filter: blur(18px);
    transform: rotate(-3deg);
    animation: float 12s ease-in-out infinite;
}

.card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.6rem;
}

.card p {
    font-size: 0.95rem;
    color: rgba(241, 245, 249, 0.7);
}

.card-one {
    top: 5%;
    left: 12%;
}

.card-two {
    bottom: 10%;
    right: 4%;
    animation-delay: 3s;
}

.floating-chip {
    position: absolute;
    bottom: 32%;
    left: 8%;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.1rem;
    border-radius: 999px;
    background: rgba(16, 185, 129, 0.18);
    color: #d1fae5;
    border: 1px solid rgba(16, 185, 129, 0.3);
    animation: float 10s ease-in-out infinite;
    animation-delay: 1.6s;
}

.chip-dot {
    display: inline-block;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0.12);
}

.form-section {
    display: flex;
    justify-content: center;
}

#new-expense {
    scroll-margin-top: 120px;
}

.form-card {
    background: var(--surface);
    border: 1px solid rgba(14, 165, 233, 0.18);
    border-radius: 1.8rem;
    padding: clamp(2rem, 4vw, 3rem);
    max-width: 720px;
    width: 100%;
    box-shadow: 0 40px 80px rgba(10, 14, 26, 0.35);
    backdrop-filter: blur(18px);
}

.form-headline h2 {
    font-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.form-headline p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-group[hidden] {
    display: none !important;
}

.input-group--api-key {
    position: relative;
    padding: 1.25rem;
    border-radius: 1.3rem;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.14), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(14, 165, 233, 0.32);
    box-shadow: 0 24px 48px rgba(10, 14, 26, 0.28);
    overflow: hidden;
}

.input-group--api-key::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at top right, rgba(14, 165, 233, 0.28), transparent 55%);
    opacity: 0.65;
}

.input-group--api-key > * {
    position: relative;
    z-index: 1;
}

.input-group--api-key input {
    background: rgba(17, 24, 39, 0.85);
    border-color: rgba(14, 165, 233, 0.35);
}

.input-group--api-key small {
    color: rgba(209, 250, 229, 0.85);
}

.input-group span {
    font-weight: 600;
    color: var(--text-primary);
}

input,
textarea {
    background: var(--surface-solid);
    border: 1px solid rgba(14, 165, 233, 0.22);
    border-radius: 1rem;
    padding: 1rem 1.2rem;
    font: inherit;
    color: var(--text-primary);
    transition: border 200ms ease, box-shadow 200ms ease;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: rgba(14, 165, 233, 0.6);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.2);
}

textarea {
    resize: vertical;
    min-height: 160px;
}

.helper-text {
    color: rgba(209, 250, 229, 0.7);
    font-size: 0.85rem;
}

.file-upload-area {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.upload-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.upload-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 1rem 1.5rem;
    border-radius: 1rem;
    background: var(--surface-solid);
    border: 1.5px dashed rgba(14, 165, 233, 0.3);
    color: var(--text-primary);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: all 200ms ease;
}

.upload-btn:hover {
    background: rgba(14, 165, 233, 0.08);
    border-color: rgba(14, 165, 233, 0.5);
    transform: translateY(-2px);
}

.upload-btn svg {
    flex-shrink: 0;
}

.file-preview {
    position: relative;
    padding: 1rem;
    border-radius: 1rem;
    background: rgba(14, 165, 233, 0.08);
    border: 1px solid rgba(14, 165, 233, 0.25);
}

.file-preview[hidden] {
    display: none;
}

.preview-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-content img {
    max-width: 100%;
    height: auto;
    max-height: 300px;
    border-radius: 0.75rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.pdf-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 2rem;
    color: var(--text-primary);
}

.pdf-preview[hidden] {
    display: none;
}

.pdf-preview svg {
    opacity: 0.7;
}

.pdf-preview span {
    font-weight: 500;
    text-align: center;
}

.remove-file {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 2rem;
    height: 2rem;
    display: grid;
    place-items: center;
    border-radius: 0.5rem;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 600;
    transition: transform 200ms ease;
}

.remove-file:hover {
    transform: scale(1.1);
    background: rgba(239, 68, 68, 1);
}

.submit-button {
    align-self: flex-start;
    padding: 0.9rem 2.2rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #0ea5e9, #10b981);
    color: #ffffff;
    font-weight: 600;
    letter-spacing: 0.02em;
    border: none;
    cursor: pointer;
    transition: transform 200ms ease, box-shadow 200ms ease;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(14, 165, 233, 0.35);
}

.submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.status {
    margin-top: 1.5rem;
    min-height: 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    display: grid;
    gap: 1.25rem;
    white-space: pre-wrap;
}


.agent-divider {
    margin: 1.25rem 0;
    border: 0;
    height: 1px;
    background: linear-gradient(90deg, rgba(14, 165, 233, 0), rgba(14, 165, 233, 0.6), rgba(14, 165, 233, 0));
}

.thinking[hidden] {
    display: none;
}

.thinking {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: flex-start;
    gap: 1rem;
    margin-top: 0;
    padding: 1rem 1.6rem;
    border-radius: 1.4rem;
    background: rgba(14, 165, 233, 0.18);
    border: 1px solid rgba(14, 165, 233, 0.35);
    color: rgba(241, 245, 249, 0.88);
    font-weight: 600;
    letter-spacing: 0.02em;
    box-shadow: 0 20px 44px rgba(14, 165, 233, 0.28);
    backdrop-filter: blur(14px);
    position: relative;
    overflow: hidden;
    align-self: flex-start;
    pointer-events: none;
    max-width: min(100%, 480px);
    z-index: 0;
}

.thinking::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(255, 255, 255, 0.12), rgba(14, 165, 233, 0));
    opacity: 0;
    animation: shimmer 3s ease-in-out infinite;
    pointer-events: none;
}

.thinking > * {
    position: relative;
    z-index: 1;
}

.thinking-content {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    min-width: 0;
}

.thinking-updates {
    display: grid;
    gap: 0.55rem;
    min-width: 0;
    max-width: clamp(12rem, 32vw, 22rem);
    overflow: hidden;
}

.thinking-update {
    position: relative;
    padding: 0.65rem 1rem 0.65rem 1.6rem;
    border-radius: 0.95rem;
    background: rgba(17, 24, 39, 0.7);
    border: 1px solid rgba(14, 165, 233, 0.35);
    color: rgba(241, 245, 249, 0.92);
    font-weight: 500;
    font-size: 0.9rem;
    line-height: 1.45;
    box-shadow: 0 18px 32px rgba(10, 14, 26, 0.22);
    backdrop-filter: blur(18px);
    overflow: hidden;
    word-break: break-word;
}

.thinking-update::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(14, 165, 233, 0.28), rgba(16, 185, 129, 0.12));
    opacity: 0;
    transition: opacity 280ms ease;
}

.thinking-update::after {
    content: "";
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 0.35rem;
    height: 0.35rem;
    border-radius: 50%;
    background: rgba(14, 165, 233, 0.85);
    box-shadow: 0 0 0 6px rgba(14, 165, 233, 0.15);
}

.thinking-update--fresh {
    animation: update-pop 280ms ease forwards;
}

.thinking-update--fresh::before {
    opacity: 0.55;
}

.thinking-spinner {
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 50%;
    border: 2px solid rgba(14, 165, 233, 0.18);
    border-top-color: rgba(14, 165, 233, 0.85);
    animation: spin 0.9s linear infinite;
}

.thinking-label {
    position: relative;
    display: inline-flex;
    align-items: center;
    transition: opacity 220ms ease, transform 220ms ease;
    white-space: nowrap;
}

.thinking-label.thinking-label--changing {
    opacity: 0;
    transform: translateY(6px);
}


.status.success {
    color: inherit;
}

.status.error {
    color: var(--error);
}

.agent-message {
    position: relative;
    display: inline-flex;
    flex-direction: column;
    align-self: flex-start;
    gap: 0.4rem;
    max-width: clamp(16rem, 60vw, 36rem);
    padding: 1.15rem 1.4rem;
    border-radius: 1.5rem;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.92), rgba(14, 165, 233, 0.78));
    border: 1px solid rgba(16, 185, 129, 0.45);
    color: #022c22;
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 1.55;
    box-shadow: 0 28px 48px rgba(16, 185, 129, 0.26);
    backdrop-filter: blur(18px);
    overflow: hidden;
    white-space: normal;
}

.agent-message::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(120deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0));
    opacity: 0.55;
    mix-blend-mode: screen;
    pointer-events: none;
    z-index: 0;
}

.agent-message::after {
    content: "";
    position: absolute;
    inset: 1px;
    border-radius: calc(1.5rem - 1px);
    border: 1px solid rgba(255, 255, 255, 0.35);
    opacity: 0.45;
    pointer-events: none;
    z-index: 0;
}

.agent-message > * {
    position: relative;
    z-index: 1;
}

.footer {
    padding: 2rem 8vw 4rem;
    text-align: center;
    color: rgba(241, 245, 249, 0.56);
    font-size: 0.9rem;
}

@keyframes update-pop {
    0% {
        transform: translateY(8px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes drift {
    0%,
    100% {
        transform: translate(0px, 0px);
    }
    50% {
        transform: translate(40px, -30px);
    }
}

@keyframes float {
    0%,
    100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-18px);
    }
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
        opacity: 0.65;
    }
    50% {
        transform: scale(1.08);
        opacity: 0.85;
    }
}

@keyframes pulse-dot {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7);
    }
    70% {
        transform: scale(1.1);
        box-shadow: 0 0 0 6px rgba(255, 255, 255, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
    }
}

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

@keyframes shimmer {
    0% {
        opacity: 0;
        transform: translateX(-40%);
    }
    50% {
        opacity: 0.6;
    }
    100% {
        opacity: 0;
        transform: translateX(60%);
    }
}

@media (max-width: 768px) {
    .topbar {
        padding: 1rem 5vw;
    }

    main {
        padding: 6vh 5vw 14vh;
    }

    .hero {
        gap: 3rem;
        text-align: center;
    }

    .hero-copy p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-button {
        justify-content: center;
        margin: 0 auto;
    }

    .hero-visual {
        min-height: 280px;
    }

    .form-card {
        padding: 2rem;
    }

    .upload-buttons {
        grid-template-columns: 1fr;
    }
}